857291172 has 48 divisors (see below), whose sum is σ = 2154620160. Its totient is φ = 264424608.

The previous prime is 857291161. The next prime is 857291177. The reversal of 857291172 is 271192758.

It is not an unprimeable number, because it can be changed into a prime (857291177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33918 + ... + 53525.

It is an arithmetic number, because the mean of its divisors is an integer number (44887920).

Almost surely, 2^857291172 is an apocalyptic number.

It is an amenable number.

857291172 is an abundant number, since it is smaller than the sum of its proper divisors (1297328988).

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

857291172 is a wasteful number, since it uses less digits than its factorization.

857291172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87512 (or 87510 counting only the distinct ones).

The product of its digits is 70560, while the sum is 42.

The square root of 857291172 is about 29279.5350372918. The cubic root of 857291172 is about 949.9690375874.

The spelling of 857291172 in words is "eight hundred fifty-seven million, two hundred ninety-one thousand, one hundred seventy-two".