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28086240 = 2535713643
BaseRepresentation
bin110101100100…
…0111111100000
31221211221002010
41223020333200
524142224430
62441552520
7460505040
oct153107740
957757063
1028086240
1114943676
1294a5740
135a84ba0
143a31720
1526ebcb0
hex1ac8fe0

28086240 has 192 divisors, whose sum is σ = 109057536. Its totient is φ = 5916672.

The previous prime is 28086229. The next prime is 28086241. The reversal of 28086240 is 4268082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28086198 and 28086207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28086241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43359 + ... + 44001.

It is an arithmetic number, because the mean of its divisors is an integer number (568008).

Almost surely, 228086240 is an apocalyptic number.

28086240 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 28086240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54528768).

28086240 is an abundant number, since it is smaller than the sum of its proper divisors (80971296).

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

28086240 is a wasteful number, since it uses less digits than its factorization.

28086240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28086240 is about 5299.6452711479. The cubic root of 28086240 is about 303.9703341319.

The spelling of 28086240 in words is "twenty-eight million, eighty-six thousand, two hundred forty".