815812928 has 56 divisors (see below), whose sum is σ = 1853135232. Its totient is φ = 349069824.

The previous prime is 815812909. The next prime is 815812931. The reversal of 815812928 is 829218518.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396350 + ... + 398402.

Almost surely, 2^815812928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815812928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926567616).

815812928 is an abundant number, since it is smaller than the sum of its proper divisors (1037322304).

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

815812928 is a wasteful number, since it uses less digits than its factorization.

815812928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959 (or 2949 counting only the distinct ones).

The product of its digits is 92160, while the sum is 44.

The square root of 815812928 is about 28562.4391115325. The cubic root of 815812928 is about 934.3943299290.

The spelling of 815812928 in words is "eight hundred fifteen million, eight hundred twelve thousand, nine hundred twenty-eight".