856597728 has 96 divisors (see below), whose sum is σ = 2590285824. Its totient is φ = 242790912.

The previous prime is 856597697. The next prime is 856597741. The reversal of 856597728 is 827795658.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×856597728² = 1467519335229523968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 80326 + ... + 90362.

It is an arithmetic number, because the mean of its divisors is an integer number (26982144).

Almost surely, 2^856597728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856597728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295142912).

856597728 is an abundant number, since it is smaller than the sum of its proper divisors (1733688096).

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

856597728 is a wasteful number, since it uses less digits than its factorization.

856597728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10184 (or 10176 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 57.

The square root of 856597728 is about 29267.6908552759. The cubic root of 856597728 is about 949.7128321320.

The spelling of 856597728 in words is "eight hundred fifty-six million, five hundred ninety-seven thousand, seven hundred twenty-eight".