644306303060 has 24 divisors (see below), whose sum is σ = 1546335127680. Its totient is φ = 220905018144.

The previous prime is 644306303057. The next prime is 644306303077. The reversal of 644306303060 is 60303603446.

It is a happy number.

It is a super-2 number, since 2×644306303060² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 644306303060.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301093800 + ... + 2301094079.

It is an arithmetic number, because the mean of its divisors is an integer number (64430630320).

Almost surely, 2^644306303060 is an apocalyptic number.

It is an amenable number.

644306303060 is an abundant number, since it is smaller than the sum of its proper divisors (902028824620).

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

644306303060 is a wasteful number, since it uses less digits than its factorization.

644306303060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4602187895 (or 4602187893 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 35.

The spelling of 644306303060 in words is "six hundred forty-four billion, three hundred six million, three hundred three thousand, sixty".