857708856 has 24 divisors (see below), whose sum is σ = 2322961680. Its totient is φ = 285902928.

The previous prime is 857708833. The next prime is 857708869. The reversal of 857708856 is 658807758.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5956240 + ... + 5956383.

It is an arithmetic number, because the mean of its divisors is an integer number (96790070).

Almost surely, 2^857708856 is an apocalyptic number.

It is an amenable number.

857708856 is an abundant number, since it is smaller than the sum of its proper divisors (1465252824).

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

857708856 is a wasteful number, since it uses less digits than its factorization.

857708856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11912635 (or 11912628 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The square root of 857708856 is about 29286.6668639502. Note that the first 3 decimals coincide. The cubic root of 857708856 is about 950.1232918470.

The spelling of 857708856 in words is "eight hundred fifty-seven million, seven hundred eight thousand, eight hundred fifty-six".