638275 has 18 divisors (see below), whose sum is σ = 874076. Its totient is φ = 462000.

The previous prime is 638269. The next prime is 638303. The reversal of 638275 is 572836.

It is not a de Polignac number, because 638275 - 2⁷ = 638147 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 (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2920 + ... + 3130.

2⁶³⁸²⁷⁵ is an apocalyptic number.

638275 is a deficient number, since it is larger than the sum of its proper divisors (235801).

638275 is a wasteful number, since it uses less digits than its factorization.

638275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 227 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 638275 is about 798.9211475484. The cubic root of 638275 is about 86.0998929387.

It can be divided in two parts, 63 and 8275, that added together give a palindrome (8338).

The spelling of 638275 in words is "six hundred thirty-eight thousand, two hundred seventy-five".