639980800144 has 45 divisors (see below), whose sum is σ = 1442456193171. Its totient is φ = 274267885920.

The previous prime is 639980800139. The next prime is 639980800159. The reversal of 639980800144 is 441008089936.

It is a happy number.

The square root of 639980800144 is 799988.

It is a perfect power (a square), and thus also a powerful number.

It is a junction number, because it is equal to n+sod(n) for n = 639980800091 and 639980800100.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22385379 + ... + 22413949.

Almost surely, 2^639980800144 is an apocalyptic number.

639980800144 is the 799988-th square number.

It is an amenable number.

639980800144 is an abundant number, since it is smaller than the sum of its proper divisors (802475393027).

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

639980800144 is an frugal number, since it uses more digits than its factorization.

639980800144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57164 (or 28580 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 639980800144 in words is "six hundred thirty-nine billion, nine hundred eighty million, eight hundred thousand, one hundred forty-four".