638613635232 has 24 divisors (see below), whose sum is σ = 1676360792736. Its totient is φ = 212871211712.

The previous prime is 638613635171. The next prime is 638613635279. The reversal of 638613635232 is 232536316836.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 3326112588 + ... + 3326112779.

It is an arithmetic number, because the mean of its divisors is an integer number (69848366364).

Almost surely, 2^638613635232 is an apocalyptic number.

It is an amenable number.

638613635232 is an abundant number, since it is smaller than the sum of its proper divisors (1037747157504).

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

638613635232 is a wasteful number, since it uses less digits than its factorization.

638613635232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6652225380 (or 6652225372 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 48.

The spelling of 638613635232 in words is "six hundred thirty-eight billion, six hundred thirteen million, six hundred thirty-five thousand, two hundred thirty-two".