2638648136 has 64 divisors (see below), whose sum is σ = 5271523200. Its totient is φ = 1235570688.

The previous prime is 2638648121. The next prime is 2638648151. The reversal of 2638648136 is 6318468362.

It is an interprime number because it is at equal distance from previous prime (2638648121) and next prime (2638648151).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2378750 + ... + 2379858.

It is an arithmetic number, because the mean of its divisors is an integer number (82367550).

Almost surely, 2^2638648136 is an apocalyptic number.

It is an amenable number.

2638648136 is a deficient number, since it is larger than the sum of its proper divisors (2632875064).

2638648136 is a wasteful number, since it uses less digits than its factorization.

2638648136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1394 counting only the distinct ones).

The product of its digits is 995328, while the sum is 47.

The square root of 2638648136 is about 51367.7733214123. The cubic root of 2638648136 is about 1381.8486978351.

The spelling of 2638648136 in words is "two billion, six hundred thirty-eight million, six hundred forty-eight thousand, one hundred thirty-six".