638075 has 6 divisors (see below), whose sum is σ = 791244. Its totient is φ = 510440.

The previous prime is 638063. The next prime is 638081. The reversal of 638075 is 570836.

It is not a de Polignac number, because 638075 - 2⁴ = 638059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12737 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (131874).

2⁶³⁸⁰⁷⁵ is an apocalyptic number.

638075 is a deficient number, since it is larger than the sum of its proper divisors (153169).

638075 is a wasteful number, since it uses less digits than its factorization.

638075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25533 (or 25528 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 638075 is about 798.7959689433. The cubic root of 638075 is about 86.0908990215.

The spelling of 638075 in words is "six hundred thirty-eight thousand, seventy-five".