856578912 has 48 divisors (see below), whose sum is σ = 2569738752. Its totient is φ = 244736640.

The previous prime is 856578911. The next prime is 856578913. The reversal of 856578912 is 219875658.

It is an interprime number because it is at equal distance from previous prime (856578911) and next prime (856578913).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856578911) 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, 636664 + ... + 638007.

It is an arithmetic number, because the mean of its divisors is an integer number (53536224).

Almost surely, 2^856578912 is an apocalyptic number.

It is an amenable number.

856578912 is an abundant number, since it is smaller than the sum of its proper divisors (1713159840).

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

856578912 is a wasteful number, since it uses less digits than its factorization.

856578912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274691 (or 1274683 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 51.

The square root of 856578912 is about 29267.3694069009. The cubic root of 856578912 is about 949.7058782932.

The spelling of 856578912 in words is "eight hundred fifty-six million, five hundred seventy-eight thousand, nine hundred twelve".