644236430038032 has 80 divisors (see below), whose sum is σ = 1833980153327168. Its totient is φ = 193616673062400.

The previous prime is 644236430038031. The next prime is 644236430038139. The reversal of 644236430038032 is 230830034632446.

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

It is not an unprimeable number, because it can be changed into a prime (644236430038031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12004975219 + ... + 12005028882.

Almost surely, 2^{644236430038032} is an apocalyptic number.

It is an amenable number.

644236430038032 is an abundant number, since it is smaller than the sum of its proper divisors (1189743723289136).

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

644236430038032 is a wasteful number, since it uses less digits than its factorization.

644236430038032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24010004168 (or 24010004162 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 48.

The spelling of 644236430038032 in words is "six hundred forty-four trillion, two hundred thirty-six billion, four hundred thirty million, thirty-eight thousand, thirty-two".