644522470 has 8 divisors (see below), whose sum is σ = 1160140464. Its totient is φ = 257808984.

The previous prime is 644522441. The next prime is 644522471. The reversal of 644522470 is 74225446.

644522470 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (644522471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32226114 + ... + 32226133.

It is an arithmetic number, because the mean of its divisors is an integer number (145017558).

Almost surely, 2^644522470 is an apocalyptic number.

644522470 is a deficient number, since it is larger than the sum of its proper divisors (515617994).

644522470 is a wasteful number, since it uses less digits than its factorization.

644522470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64452254.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 644522470 is about 25387.4470949720. The cubic root of 644522470 is about 863.7989814053.

The spelling of 644522470 in words is "six hundred forty-four million, five hundred twenty-two thousand, four hundred seventy".