7997513256 has 24 divisors (see below), whose sum is σ = 21659931930. Its totient is φ = 2665837728.

The previous prime is 7997513239. The next prime is 7997513261. The reversal of 7997513256 is 6523157997.

7997513256 is a `hidden beast` number, since 79 + 9 + 7 + 513 + 2 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7298968356 + 698544900 = 85434^2 + 26430^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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, 55538215 + ... + 55538358.

Almost surely, 2^7997513256 is an apocalyptic number.

It is an amenable number.

7997513256 is an abundant number, since it is smaller than the sum of its proper divisors (13662418674).

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

7997513256 is a wasteful number, since it uses less digits than its factorization.

7997513256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111076585 (or 111076578 counting only the distinct ones).

The product of its digits is 3572100, while the sum is 54.

The square root of 7997513256 is about 89428.8166979749. The cubic root of 7997513256 is about 1999.7927498578.

The spelling of 7997513256 in words is "seven billion, nine hundred ninety-seven million, five hundred thirteen thousand, two hundred fifty-six".