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8028181 = 77971439
BaseRepresentation
bin11110101000000000010101
3120002212121001
4132220000111
54023400211
6444023301
7125144530
oct36500025
916085531
108028181
114593767
122831b31
131881205
1410cda17
15a88ac1
hex7a8015

8028181 has 8 divisors (see below), whose sum is σ = 9192960. Its totient is φ = 6867888.

The previous prime is 8028179. The next prime is 8028193. The reversal of 8028181 is 1818208.

8028181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8028181 - 21 = 8028179 is a prime.

It is a super-2 number, since 2×80281812 = 128903380337522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8028121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4860 + ... + 6298.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 28028181 is an apocalyptic number.

It is an amenable number.

8028181 is a deficient number, since it is larger than the sum of its proper divisors (1164779).

8028181 is a wasteful number, since it uses less digits than its factorization.

8028181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 8028181 is about 2833.4044893026. The cubic root of 8028181 is about 200.2345664520.

The spelling of 8028181 in words is "eight million, twenty-eight thousand, one hundred eighty-one".

Divisors: 1 7 797 1439 5579 10073 1146883 8028181