813684780 has 72 divisors (see below), whose sum is σ = 2470510224. Its totient is φ = 216777600.

The previous prime is 813684769. The next prime is 813684799. The reversal of 813684780 is 87486318.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346410 + ... + 348750.

It is an arithmetic number, because the mean of its divisors is an integer number (34312642).

Almost surely, 2^813684780 is an apocalyptic number.

It is an amenable number.

813684780 is an abundant number, since it is smaller than the sum of its proper divisors (1656825444).

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

813684780 is a wasteful number, since it uses less digits than its factorization.

813684780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287 (or 4282 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 813684780 is about 28525.1604728177. The cubic root of 813684780 is about 933.5811283669.

The spelling of 813684780 in words is "eight hundred thirteen million, six hundred eighty-four thousand, seven hundred eighty".