2520815256 has 160 divisors (see below), whose sum is σ = 7444839600. Its totient is φ = 795674880.

The previous prime is 2520815239. The next prime is 2520815261. The reversal of 2520815256 is 6525180252.

It is a happy number.

2520815256 is a `hidden beast` number, since 2 + 52 + 0 + 81 + 525 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2520815256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 994711 + ... + 997241.

Almost surely, 2^2520815256 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 2520815256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3722419800).

2520815256 is an abundant number, since it is smaller than the sum of its proper divisors (4924024344).

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

2520815256 is a wasteful number, since it uses less digits than its factorization.

2520815256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631 (or 2618 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 2520815256 is about 50207.7210795312. The cubic root of 2520815256 is about 1360.9651554352.

The spelling of 2520815256 in words is "two billion, five hundred twenty million, eight hundred fifteen thousand, two hundred fifty-six".