2638725688 has 16 divisors (see below), whose sum is σ = 4995647280. Its totient is φ = 1306553088.

The previous prime is 2638725647. The next prime is 2638725709. The reversal of 2638725688 is 8865278362.

It is a super-2 number, since 2×2638725688² = 13925746513022146688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600345 + ... + 1601992.

It is an arithmetic number, because the mean of its divisors is an integer number (312227955).

Almost surely, 2^2638725688 is an apocalyptic number.

It is an amenable number.

2638725688 is a deficient number, since it is larger than the sum of its proper divisors (2356921592).

2638725688 is a wasteful number, since it uses less digits than its factorization.

2638725688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202446 (or 3202442 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 55.

The square root of 2638725688 is about 51368.5281860401. The cubic root of 2638725688 is about 1381.8622355856.

The spelling of 2638725688 in words is "two billion, six hundred thirty-eight million, seven hundred twenty-five thousand, six hundred eighty-eight".