638893875 has 16 divisors (see below), whose sum is σ = 1063120032. Its totient is φ = 340743200.

The previous prime is 638893873. The next prime is 638893903. The reversal of 638893875 is 578398836.

It is not a de Polignac number, because 638893875 - 2¹ = 638893873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638893873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851484 + ... + 852233.

It is an arithmetic number, because the mean of its divisors is an integer number (66445002).

Almost surely, 2^638893875 is an apocalyptic number.

638893875 is a deficient number, since it is larger than the sum of its proper divisors (424226157).

638893875 is a wasteful number, since it uses less digits than its factorization.

638893875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703735 (or 1703725 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 57.

The square root of 638893875 is about 25276.3501123085. The cubic root of 638893875 is about 861.2771159510.

The spelling of 638893875 in words is "six hundred thirty-eight million, eight hundred ninety-three thousand, eight hundred seventy-five".