644602272 has 24 divisors (see below), whose sum is σ = 1692081216. Its totient is φ = 214867392.

The previous prime is 644602247. The next prime is 644602289. The reversal of 644602272 is 272206446.

644602272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3357208 + ... + 3357399.

It is an arithmetic number, because the mean of its divisors is an integer number (70503384).

Almost surely, 2^644602272 is an apocalyptic number.

It is an amenable number.

644602272 is an abundant number, since it is smaller than the sum of its proper divisors (1047478944).

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

644602272 is a wasteful number, since it uses less digits than its factorization.

644602272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6714620 (or 6714612 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 644602272 is about 25389.0187285763. The cubic root of 644602272 is about 863.8346305588.

The spelling of 644602272 in words is "six hundred forty-four million, six hundred two thousand, two hundred seventy-two".