638970527220 has 48 divisors (see below), whose sum is σ = 1789152297408. Its totient is φ = 170388824320.

The previous prime is 638970527207. The next prime is 638970527243. The reversal of 638970527220 is 22725079836.

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, 5590687 + ... + 5703833.

It is an arithmetic number, because the mean of its divisors is an integer number (37274006196).

Almost surely, 2^638970527220 is an apocalyptic number.

638970527220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638970527220 is an abundant number, since it is smaller than the sum of its proper divisors (1150181770188).

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

638970527220 is a wasteful number, since it uses less digits than its factorization.

638970527220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207280 (or 207278 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 638970527220 in words is "six hundred thirty-eight billion, nine hundred seventy million, five hundred twenty-seven thousand, two hundred twenty".