638750632 has 16 divisors (see below), whose sum is σ = 1289785140. Its totient is φ = 294807936.

The previous prime is 638750621. The next prime is 638750699. The reversal of 638750632 is 236057836.

It can be written as a sum of positive squares in 2 ways, for example, as 551028676 + 87721956 = 23474^2 + 9366^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3070813 + ... + 3071020.

Almost surely, 2^638750632 is an apocalyptic number.

It is an amenable number.

638750632 is an abundant number, since it is smaller than the sum of its proper divisors (651034508).

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

638750632 is a wasteful number, since it uses less digits than its factorization.

638750632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6141852 (or 6141848 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 638750632 is about 25273.5164154100. The cubic root of 638750632 is about 861.2127436851.

The spelling of 638750632 in words is "six hundred thirty-eight million, seven hundred fifty thousand, six hundred thirty-two".