638600975 has 12 divisors (see below), whose sum is σ = 806807736. Its totient is φ = 501240480.

The previous prime is 638600969. The next prime is 638600981. The reversal of 638600975 is 579006836.

It is an interprime number because it is at equal distance from previous prime (638600969) and next prime (638600981).

It is not a de Polignac number, because 638600975 - 2⁴ = 638600959 is a prime.

It is a super-2 number, since 2×638600975² = 815622410541901250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239657 + ... + 242306.

It is an arithmetic number, because the mean of its divisors is an integer number (67233978).

Almost surely, 2^638600975 is an apocalyptic number.

638600975 is a deficient number, since it is larger than the sum of its proper divisors (168206761).

638600975 is a wasteful number, since it uses less digits than its factorization.

638600975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482026 (or 482021 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 638600975 is about 25270.5554944880. Note that the first 3 decimals coincide. The cubic root of 638600975 is about 861.1454787378.

The spelling of 638600975 in words is "six hundred thirty-eight million, six hundred thousand, nine hundred seventy-five".