644235584160 has 192 divisors, whose sum is σ = 2353864568832. Its totient is φ = 145055978496.

The previous prime is 644235584143. The next prime is 644235584207. The reversal of 644235584160 is 61485532446.

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

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1205752 + ... + 1655991.

It is an arithmetic number, because the mean of its divisors is an integer number (12259711296).

Almost surely, 2^644235584160 is an apocalyptic number.

644235584160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

644235584160 is an abundant number, since it is smaller than the sum of its proper divisors (1709628984672).

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

644235584160 is a wasteful number, since it uses less digits than its factorization.

644235584160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861835 (or 2861827 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 644235584160 in words is "six hundred forty-four billion, two hundred thirty-five million, five hundred eighty-four thousand, one hundred sixty".