638353647328 has 24 divisors (see below), whose sum is σ = 1256779602792. Its totient is φ = 319171526016.

The previous prime is 638353647313. The next prime is 638353647409. The reversal of 638353647328 is 823746353836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2408026 + ... + 2659942.

It is an arithmetic number, because the mean of its divisors is an integer number (52365816783).

Almost surely, 2^638353647328 is an apocalyptic number.

It is an amenable number.

638353647328 is a deficient number, since it is larger than the sum of its proper divisors (618425955464).

638353647328 is a wasteful number, since it uses less digits than its factorization.

638353647328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331114 (or 331106 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 58.

The spelling of 638353647328 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred forty-seven thousand, three hundred twenty-eight".