638407232430 has 48 divisors (see below), whose sum is σ = 1684128840912. Its totient is φ = 154765388800.

The previous prime is 638407232399. The next prime is 638407232459. The reversal of 638407232430 is 34232704836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87931251 + ... + 87938510.

It is an arithmetic number, because the mean of its divisors is an integer number (35086017519).

Almost surely, 2^638407232430 is an apocalyptic number.

638407232430 is an abundant number, since it is smaller than the sum of its proper divisors (1045721608482).

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

638407232430 is a wasteful number, since it uses less digits than its factorization.

638407232430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175869793 (or 175869782 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 42.

The spelling of 638407232430 in words is "six hundred thirty-eight billion, four hundred seven million, two hundred thirty-two thousand, four hundred thirty".