638870485452 has 12 divisors (see below), whose sum is σ = 1490697799416. Its totient is φ = 212956828480.

The previous prime is 638870485441. The next prime is 638870485531. The reversal of 638870485452 is 254584078836.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26619603549 + ... + 26619603572.

It is an arithmetic number, because the mean of its divisors is an integer number (124224816618).

Almost surely, 2^638870485452 is an apocalyptic number.

It is an amenable number.

638870485452 is an abundant number, since it is smaller than the sum of its proper divisors (851827313964).

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

638870485452 is a wasteful number, since it uses less digits than its factorization.

638870485452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53239207128 (or 53239207126 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 60.

The spelling of 638870485452 in words is "six hundred thirty-eight billion, eight hundred seventy million, four hundred eighty-five thousand, four hundred fifty-two".