2638246440 has 32 divisors (see below), whose sum is σ = 7914739680. Its totient is φ = 703532352.

The previous prime is 2638246421. The next prime is 2638246451. The reversal of 2638246440 is 446428362.

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, 10992574 + ... + 10992813.

It is an arithmetic number, because the mean of its divisors is an integer number (247335615).

Almost surely, 2^2638246440 is an apocalyptic number.

2638246440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2638246440 is an abundant number, since it is smaller than the sum of its proper divisors (5276493240).

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

2638246440 is a wasteful number, since it uses less digits than its factorization.

2638246440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21985401 (or 21985397 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 39.

The square root of 2638246440 is about 51363.8631724679. The cubic root of 2638246440 is about 1381.7785721197.

The spelling of 2638246440 in words is "two billion, six hundred thirty-eight million, two hundred forty-six thousand, four hundred forty".