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28074040 = 23547109137
BaseRepresentation
bin110101100011…
…0000000111000
31221211022100021
41223012000320
524141332130
62441420224
7460424341
oct153060070
957738307
1028074040
1114935495
12949a674
135a7c477
143a2b0c8
1526e837a
hex1ac6038

28074040 has 64 divisors (see below), whose sum is σ = 65577600. Its totient is φ = 10810368.

The previous prime is 28074037. The next prime is 28074043. The reversal of 28074040 is 4047082.

It is an interprime number because it is at equal distance from previous prime (28074037) and next prime (28074043).

It is a tetranacci number.

It is a junction number, because it is equal to n+sod(n) for n = 28073996 and 28074014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28074043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204852 + ... + 204988.

It is an arithmetic number, because the mean of its divisors is an integer number (1024650).

Almost surely, 228074040 is an apocalyptic number.

28074040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28074040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32788800).

28074040 is an abundant number, since it is smaller than the sum of its proper divisors (37503560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28074040 is a wasteful number, since it uses less digits than its factorization.

28074040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 28074040 is about 5298.4941256927. The cubic root of 28074040 is about 303.9263152439.

The spelling of 28074040 in words is "twenty-eight million, seventy-four thousand, forty".

Divisors: 1 2 4 5 8 10 20 40 47 94 109 137 188 218 235 274 376 436 470 545 548 685 872 940 1090 1096 1370 1880 2180 2740 4360 5123 5480 6439 10246 12878 14933 20492 25615 25756 29866 32195 40984 51230 51512 59732 64390 74665 102460 119464 128780 149330 204920 257560 298660 597320 701851 1403702 2807404 3509255 5614808 7018510 14037020 28074040