856773640 has 64 divisors (see below), whose sum is σ = 1950327360. Its totient is φ = 338722560.

The previous prime is 856773613. The next prime is 856773683. The reversal of 856773640 is 46377658.

It is a super-2 number, since 2×856773640² = 1468122140397699200, which contains 22 as substring.

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, 2157922 + ... + 2158318.

It is an arithmetic number, because the mean of its divisors is an integer number (30473865).

Almost surely, 2^856773640 is an apocalyptic number.

It is an amenable number.

856773640 is an abundant number, since it is smaller than the sum of its proper divisors (1093553720).

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

856773640 is a wasteful number, since it uses less digits than its factorization.

856773640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The square root of 856773640 is about 29270.6959261306. The cubic root of 856773640 is about 949.7778390943. Note that the first 3 decimals are identical.

The spelling of 856773640 in words is "eight hundred fifty-six million, seven hundred seventy-three thousand, six hundred forty".