856380660 has 24 divisors (see below), whose sum is σ = 2397866016. Its totient is φ = 228368160.

The previous prime is 856380659. The next prime is 856380671. The reversal of 856380660 is 66083658.

856380660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 7136446 + ... + 7136565.

It is an arithmetic number, because the mean of its divisors is an integer number (99911084).

Almost surely, 2^856380660 is an apocalyptic number.

It is an amenable number.

856380660 is an abundant number, since it is smaller than the sum of its proper divisors (1541485356).

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

856380660 is a wasteful number, since it uses less digits than its factorization.

856380660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14273023 (or 14273021 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 856380660 is about 29263.9822990652. The cubic root of 856380660 is about 949.6326040100.

The spelling of 856380660 in words is "eight hundred fifty-six million, three hundred eighty thousand, six hundred sixty".