644214524 has 72 divisors (see below), whose sum is σ = 1247726592. Its totient is φ = 290778880.

The previous prime is 644214491. The next prime is 644214547. The reversal of 644214524 is 425412446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3857489 + ... + 3857655.

It is an arithmetic number, because the mean of its divisors is an integer number (17329536).

Almost surely, 2^644214524 is an apocalyptic number.

It is an amenable number.

644214524 is a deficient number, since it is larger than the sum of its proper divisors (603512068).

644214524 is a wasteful number, since it uses less digits than its factorization.

644214524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 304 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 644214524 is about 25381.3814438852. The cubic root of 644214524 is about 863.6613881590.

The spelling of 644214524 in words is "six hundred forty-four million, two hundred fourteen thousand, five hundred twenty-four".