638315324 has 18 divisors (see below), whose sum is σ = 1123488072. Its totient is φ = 317329200.

The previous prime is 638315299. The next prime is 638315329. The reversal of 638315324 is 423513836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638315329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128609 + ... + 133479.

It is an arithmetic number, because the mean of its divisors is an integer number (62416004).

Almost surely, 2^638315324 is an apocalyptic number.

It is an amenable number.

638315324 is a deficient number, since it is larger than the sum of its proper divisors (485172748).

638315324 is a wasteful number, since it uses less digits than its factorization.

638315324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5237 (or 5054 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 638315324 is about 25264.9030079278. The cubic root of 638315324 is about 861.0170606472.

The spelling of 638315324 in words is "six hundred thirty-eight million, three hundred fifteen thousand, three hundred twenty-four".