638353647330 has 32 divisors (see below), whose sum is σ = 1750912861824. Its totient is φ = 145909405056.

The previous prime is 638353647313. The next prime is 638353647409. The reversal of 638353647330 is 33746353836.

It is a super-2 number, since 2×638353647330² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1519889427 + ... + 1519889846.

It is an arithmetic number, because the mean of its divisors is an integer number (54716026932).

Almost surely, 2^638353647330 is an apocalyptic number.

638353647330 is an abundant number, since it is smaller than the sum of its proper divisors (1112559214494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638353647330 is a wasteful number, since it uses less digits than its factorization.

638353647330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039779290.

The product of its (nonzero) digits is 9797760, while the sum is 51.

The spelling of 638353647330 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred forty-seven thousand, three hundred thirty".