644769331080 has 128 divisors (see below), whose sum is σ = 2281948692480. Its totient is φ = 142621781760.

The previous prime is 644769331079. The next prime is 644769331133. The reversal of 644769331080 is 80133967446.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12354324 + ... + 12406403.

It is an arithmetic number, because the mean of its divisors is an integer number (17827724160).

Almost surely, 2^644769331080 is an apocalyptic number.

644769331080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

644769331080 is an abundant number, since it is smaller than the sum of its proper divisors (1637179361400).

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

644769331080 is a wasteful number, since it uses less digits than its factorization.

644769331080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24760779 (or 24760775 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 644769331080 in words is "six hundred forty-four billion, seven hundred sixty-nine million, three hundred thirty-one thousand, eighty".