638881375 has 32 divisors (see below), whose sum is σ = 874036800. Its totient is φ = 462384000.

The previous prime is 638881361. The next prime is 638881409. The reversal of 638881375 is 573188836.

638881375 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638881375 - 2⁵ = 638881343 is a prime.

It is a super-2 number, since 2×638881375² = 816338822643781250, 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 31 ways as a sum of consecutive naturals, for example, 313861 + ... + 315889.

It is an arithmetic number, because the mean of its divisors is an integer number (27313650).

Almost surely, 2^638881375 is an apocalyptic number.

638881375 is a deficient number, since it is larger than the sum of its proper divisors (235155425).

638881375 is a wasteful number, since it uses less digits than its factorization.

638881375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284 (or 2274 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The square root of 638881375 is about 25276.1028443864. The cubic root of 638881375 is about 861.2714989335.

The spelling of 638881375 in words is "six hundred thirty-eight million, eight hundred eighty-one thousand, three hundred seventy-five".