857907928820 has 24 divisors (see below), whose sum is σ = 1801644362784. Its totient is φ = 343155988256.

The previous prime is 857907928793. The next prime is 857907928831. The reversal of 857907928820 is 28829709758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588899 + ... + 1436181.

It is an arithmetic number, because the mean of its divisors is an integer number (75068515116).

Almost surely, 2^857907928820 is an apocalyptic number.

It is an amenable number.

857907928820 is an abundant number, since it is smaller than the sum of its proper divisors (943736433964).

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

857907928820 is a wasteful number, since it uses less digits than its factorization.

857907928820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897919 (or 897917 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 65.

The spelling of 857907928820 in words is "eight hundred fifty-seven billion, nine hundred seven million, nine hundred twenty-eight thousand, eight hundred twenty".