865857136 has 10 divisors (see below), whose sum is σ = 1677598232. Its totient is φ = 432928560.

The previous prime is 865857127. The next prime is 865857169. The reversal of 865857136 is 631758568.

It is a self number, because there is not a number n which added to its sum of digits gives 865857136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27058020 + ... + 27058051.

Almost surely, 2^865857136 is an apocalyptic number.

It is an amenable number.

865857136 is a deficient number, since it is larger than the sum of its proper divisors (811741096).

865857136 is a wasteful number, since it uses less digits than its factorization.

865857136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54116079 (or 54116073 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 49.

The square root of 865857136 is about 29425.4504808338. The cubic root of 865857136 is about 953.1225547779.

The spelling of 865857136 in words is "eight hundred sixty-five million, eight hundred fifty-seven thousand, one hundred thirty-six".