638654073740 has 24 divisors (see below), whose sum is σ = 1342803204960. Its totient is φ = 255151219968.

The previous prime is 638654073721. The next prime is 638654073779. The reversal of 638654073740 is 47370456836.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19383725 + ... + 19416644.

It is an arithmetic number, because the mean of its divisors is an integer number (55950133540).

Almost surely, 2^638654073740 is an apocalyptic number.

It is an amenable number.

638654073740 is an abundant number, since it is smaller than the sum of its proper divisors (704149131220).

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

638654073740 is a wasteful number, since it uses less digits than its factorization.

638654073740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38801201 (or 38801199 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 53.

The spelling of 638654073740 in words is "six hundred thirty-eight billion, six hundred fifty-four million, seventy-three thousand, seven hundred forty".