638494760 has 32 divisors (see below), whose sum is σ = 1437461640. Its totient is φ = 255247104.

The previous prime is 638494741. The next prime is 638494799. The reversal of 638494760 is 67494836.

638494760 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 635745796 + 2748964 = 25214^2 + 1658^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84914 + ... + 92126.

Almost surely, 2^638494760 is an apocalyptic number.

It is an amenable number.

638494760 is an abundant number, since it is smaller than the sum of its proper divisors (798966880).

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

638494760 is a wasteful number, since it uses less digits than its factorization.

638494760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9437 (or 9433 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 638494760 is about 25268.4538506019. The cubic root of 638494760 is about 861.0977328881.

The spelling of 638494760 in words is "six hundred thirty-eight million, four hundred ninety-four thousand, seven hundred sixty".