857685756 has 12 divisors (see below), whose sum is σ = 2001266792. Its totient is φ = 285895248.

The previous prime is 857685749. The next prime is 857685757. The reversal of 857685756 is 657586758.

857685756 is nontrivially palindromic in base 11.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 857685696 and 857685705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857685757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35736895 + ... + 35736918.

Almost surely, 2^857685756 is an apocalyptic number.

It is an amenable number.

857685756 is an abundant number, since it is smaller than the sum of its proper divisors (1143581036).

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

857685756 is a wasteful number, since it uses less digits than its factorization.

857685756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71473820 (or 71473818 counting only the distinct ones).

The product of its digits is 14112000, while the sum is 57.

The square root of 857685756 is about 29286.2724838789. The cubic root of 857685756 is about 950.1147621285.

The spelling of 857685756 in words is "eight hundred fifty-seven million, six hundred eighty-five thousand, seven hundred fifty-six".