638761324 has 36 divisors (see below), whose sum is σ = 1166600232. Its totient is φ = 305992320.

The previous prime is 638761309. The next prime is 638761339. The reversal of 638761324 is 423167836.

It is an interprime number because it is at equal distance from previous prime (638761309) and next prime (638761339).

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, 410532 + ... + 412084.

It is an arithmetic number, because the mean of its divisors is an integer number (32405562).

Almost surely, 2^638761324 is an apocalyptic number.

It is an amenable number.

638761324 is a deficient number, since it is larger than the sum of its proper divisors (527838908).

638761324 is a wasteful number, since it uses less digits than its factorization.

638761324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726 (or 1693 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 638761324 is about 25273.7279402940. The cubic root of 638761324 is about 861.2175489173.

The spelling of 638761324 in words is "six hundred thirty-eight million, seven hundred sixty-one thousand, three hundred twenty-four".