638530760 has 48 divisors (see below), whose sum is σ = 1671261660. Its totient is φ = 218924160.

The previous prime is 638530759. The next prime is 638530771. The reversal of 638530760 is 67035836.

It can be written as a sum of positive squares in 2 ways, for example, as 621704356 + 16826404 = 24934^2 + 4102^2 .

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 11 ways as a sum of consecutive naturals, for example, 160931 + ... + 164850.

Almost surely, 2^638530760 is an apocalyptic number.

It is an amenable number.

638530760 is an abundant number, since it is smaller than the sum of its proper divisors (1032730900).

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

638530760 is a wasteful number, since it uses less digits than its factorization.

638530760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325806 (or 325795 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 638530760 is about 25269.1661912300. The cubic root of 638530760 is about 861.1139162293.

The spelling of 638530760 in words is "six hundred thirty-eight million, five hundred thirty thousand, seven hundred sixty".