644752628160 has 112 divisors (see below), whose sum is σ = 2047581697056. Its totient is φ = 171892703232.

The previous prime is 644752628129. The next prime is 644752628161. The reversal of 644752628160 is 61826257446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644752628161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4023492 + ... + 4180668.

It is an arithmetic number, because the mean of its divisors is an integer number (18281979438).

Almost surely, 2^644752628160 is an apocalyptic number.

644752628160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

644752628160 is an abundant number, since it is smaller than the sum of its proper divisors (1402829068896).

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

644752628160 is a wasteful number, since it uses less digits than its factorization.

644752628160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161470 (or 161460 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 644752628160 in words is "six hundred forty-four billion, seven hundred fifty-two million, six hundred twenty-eight thousand, one hundred sixty".