638580740472 has 64 divisors (see below), whose sum is σ = 1775024388000. Its totient is φ = 212717567232.

The previous prime is 638580740431. The next prime is 638580740503. The reversal of 638580740472 is 274047085836.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 667597 + ... + 1312572.

Almost surely, 2^638580740472 is an apocalyptic number.

It is an amenable number.

638580740472 is an abundant number, since it is smaller than the sum of its proper divisors (1136443647528).

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

638580740472 is a wasteful number, since it uses less digits than its factorization.

638580740472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981677 (or 1981667 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 54.

The spelling of 638580740472 in words is "six hundred thirty-eight billion, five hundred eighty million, seven hundred forty thousand, four hundred seventy-two".