644424660060 has 96 divisors (see below), whose sum is σ = 1902225088512. Its totient is φ = 162764751360.

The previous prime is 644424660007. The next prime is 644424660083. The reversal of 644424660060 is 60066424446.

644424660060 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644424659994 and 644424660021.

It is a congruent number.

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, 3598377 + ... + 3773216.

It is an arithmetic number, because the mean of its divisors is an integer number (19814844672).

Almost surely, 2^644424660060 is an apocalyptic number.

644424660060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

644424660060 is an abundant number, since it is smaller than the sum of its proper divisors (1257800428452).

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

644424660060 is a wasteful number, since it uses less digits than its factorization.

644424660060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371683 (or 7371681 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 644424660060 in words is "six hundred forty-four billion, four hundred twenty-four million, six hundred sixty thousand, sixty".