813440472856 has 24 divisors (see below), whose sum is σ = 1676460480660. Its totient is φ = 369745669040.

The previous prime is 813440472829. The next prime is 813440472893. The reversal of 813440472856 is 658274044318.

813440472856 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 5 ways as a sum of consecutive naturals, for example, 420164566 + ... + 420166501.

Almost surely, 2^813440472856 is an apocalyptic number.

It is an amenable number.

813440472856 is an abundant number, since it is smaller than the sum of its proper divisors (863020007804).

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

813440472856 is a wasteful number, since it uses less digits than its factorization.

813440472856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840331095 (or 840331080 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 52.

The spelling of 813440472856 in words is "eight hundred thirteen billion, four hundred forty million, four hundred seventy-two thousand, eight hundred fifty-six".