815873980 has 12 divisors (see below), whose sum is σ = 1713335400. Its totient is φ = 326349584.

The previous prime is 815873957. The next prime is 815874043. The reversal of 815873980 is 89378518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20396830 + ... + 20396869.

It is an arithmetic number, because the mean of its divisors is an integer number (142777950).

Almost surely, 2^815873980 is an apocalyptic number.

It is an amenable number.

815873980 is an abundant number, since it is smaller than the sum of its proper divisors (897461420).

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

815873980 is a wasteful number, since it uses less digits than its factorization.

815873980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40793708 (or 40793706 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 815873980 is about 28563.5078377989. The cubic root of 815873980 is about 934.4176380583.

The spelling of 815873980 in words is "eight hundred fifteen million, eight hundred seventy-three thousand, nine hundred eighty".