638710247708 has 24 divisors (see below), whose sum is σ = 1204434325248. Its totient is φ = 294615182016.

The previous prime is 638710247677. The next prime is 638710247837. The reversal of 638710247708 is 807742017836.

It is a self number, because there is not a number n which added to its sum of digits gives 638710247708.

It is a congruent number.

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, 3539516 + ... + 3715587.

It is an arithmetic number, because the mean of its divisors is an integer number (50184763552).

Almost surely, 2^638710247708 is an apocalyptic number.

It is an amenable number.

638710247708 is a deficient number, since it is larger than the sum of its proper divisors (565724077540).

638710247708 is a wasteful number, since it uses less digits than its factorization.

638710247708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7256813 (or 7256811 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 53.

The spelling of 638710247708 in words is "six hundred thirty-eight billion, seven hundred ten million, two hundred forty-seven thousand, seven hundred eight".