2499640256 has 56 divisors (see below), whose sum is σ = 5094061440. Its totient is φ = 1216518912.

The previous prime is 2499640243. The next prime is 2499640261. The reversal of 2499640256 is 6520469942.

It is a self number, because there is not a number n which added to its sum of digits gives 2499640256.

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, 385715 + ... + 392141.

Almost surely, 2^2499640256 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 2499640256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2547030720).

2499640256 is an abundant number, since it is smaller than the sum of its proper divisors (2594421184).

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

2499640256 is a wasteful number, since it uses less digits than its factorization.

2499640256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6601 (or 6591 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 2499640256 is about 49996.4024305749. The cubic root of 2499640256 is about 1357.1437054779.

The spelling of 2499640256 in words is "two billion, four hundred ninety-nine million, six hundred forty thousand, two hundred fifty-six".