857680922988 has 36 divisors (see below), whose sum is σ = 2237963128128. Its totient is φ = 276671265120.

The previous prime is 857680922977. The next prime is 857680923007. The reversal of 857680922988 is 889229086758.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384264531 + ... + 384266762.

It is an arithmetic number, because the mean of its divisors is an integer number (62165642448).

Almost surely, 2^857680922988 is an apocalyptic number.

It is an amenable number.

857680922988 is an abundant number, since it is smaller than the sum of its proper divisors (1380282205140).

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

857680922988 is a wasteful number, since it uses less digits than its factorization.

857680922988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768531334 (or 768531329 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 72.

The spelling of 857680922988 in words is "eight hundred fifty-seven billion, six hundred eighty million, nine hundred twenty-two thousand, nine hundred eighty-eight".