815901672 has 64 divisors (see below), whose sum is σ = 2162808000. Its totient is φ = 255605760.

The previous prime is 815901661. The next prime is 815901727. The reversal of 815901672 is 276109518.

It is a self number, because there is not a number n which added to its sum of digits gives 815901672.

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, 525954 + ... + 527502.

It is an arithmetic number, because the mean of its divisors is an integer number (33793875).

Almost surely, 2^815901672 is an apocalyptic number.

It is an amenable number.

815901672 is an abundant number, since it is smaller than the sum of its proper divisors (1346906328).

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

815901672 is a wasteful number, since it uses less digits than its factorization.

815901672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2862 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 815901672 is about 28563.9925780693. The cubic root of 815901672 is about 934.4282097892.

The spelling of 815901672 in words is "eight hundred fifteen million, nine hundred one thousand, six hundred seventy-two".