638735068460 has 24 divisors (see below), whose sum is σ = 1350345956400. Its totient is φ = 253779301184.

The previous prime is 638735068403. The next prime is 638735068487. The reversal of 638735068460 is 64860537836.

It is a junction number, because it is equal to n+sod(n) for n = 638735068396 and 638735068405.

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, 107167334 + ... + 107173293.

It is an arithmetic number, because the mean of its divisors is an integer number (56264414850).

Almost surely, 2^638735068460 is an apocalyptic number.

It is an amenable number.

638735068460 is an abundant number, since it is smaller than the sum of its proper divisors (711610887940).

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

638735068460 is a wasteful number, since it uses less digits than its factorization.

638735068460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214340785 (or 214340783 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 638735068460 in words is "six hundred thirty-eight billion, seven hundred thirty-five million, sixty-eight thousand, four hundred sixty".