644360965 has 16 divisors (see below), whose sum is σ = 814806720. Its totient is φ = 487831680.

The previous prime is 644360933. The next prime is 644361017. The reversal of 644360965 is 569063446.

It is not a de Polignac number, because 644360965 - 2⁵ = 644360933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100537 + ... + 106753.

It is an arithmetic number, because the mean of its divisors is an integer number (50925420).

Almost surely, 2^644360965 is an apocalyptic number.

It is an amenable number.

644360965 is a deficient number, since it is larger than the sum of its proper divisors (170445755).

644360965 is a wasteful number, since it uses less digits than its factorization.

644360965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7332.

The product of its (nonzero) digits is 466560, while the sum is 43.

The square root of 644360965 is about 25384.2660914197. The cubic root of 644360965 is about 863.7268248784.

The spelling of 644360965 in words is "six hundred forty-four million, three hundred sixty thousand, nine hundred sixty-five".