644301745 has 8 divisors (see below), whose sum is σ = 773299584. Its totient is φ = 515349744.

The previous prime is 644301739. The next prime is 644301769. The reversal of 644301745 is 547103446.

644301745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 644301745 - 2⁷ = 644301617 is a prime.

It is a super-2 number, since 2×644301745² = 830249477220090050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 644301745.

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, 43032 + ... + 56038.

It is an arithmetic number, because the mean of its divisors is an integer number (96662448).

Almost surely, 2^644301745 is an apocalyptic number.

It is an amenable number.

644301745 is a deficient number, since it is larger than the sum of its proper divisors (128997839).

644301745 is a wasteful number, since it uses less digits than its factorization.

644301745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22919.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 644301745 is about 25383.0995940212. The cubic root of 644301745 is about 863.7003637940.

The spelling of 644301745 in words is "six hundred forty-four million, three hundred one thousand, seven hundred forty-five".