856618540 has 24 divisors (see below), whose sum is σ = 1800162000. Its totient is φ = 342406848.

The previous prime is 856618537. The next prime is 856618541. The reversal of 856618540 is 45816658.

It is not an unprimeable number, because it can be changed into a prime (856618541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15694 + ... + 44266.

It is an arithmetic number, because the mean of its divisors is an integer number (75006750).

Almost surely, 2^856618540 is an apocalyptic number.

It is an amenable number.

856618540 is an abundant number, since it is smaller than the sum of its proper divisors (943543460).

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

856618540 is a wasteful number, since it uses less digits than its factorization.

856618540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30081 (or 30079 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 856618540 is about 29268.0463987605. The cubic root of 856618540 is about 949.7205235149.

The spelling of 856618540 in words is "eight hundred fifty-six million, six hundred eighteen thousand, five hundred forty".