857206320 has 80 divisors (see below), whose sum is σ = 2772893952. Its totient is φ = 218648320.

The previous prime is 857206319. The next prime is 857206379. The reversal of 857206320 is 23602758.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72126 + ... + 83165.

Almost surely, 2^857206320 is an apocalyptic number.

857206320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857206320 is an abundant number, since it is smaller than the sum of its proper divisors (1915687632).

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

857206320 is a wasteful number, since it uses less digits than its factorization.

857206320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155330 (or 155324 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 857206320 is about 29278.0860030160. The cubic root of 857206320 is about 949.9376948982.

The spelling of 857206320 in words is "eight hundred fifty-seven million, two hundred six thousand, three hundred twenty".