644420714 has 32 divisors (see below), whose sum is σ = 1125570816. Its totient is φ = 270990720.

The previous prime is 644420681. The next prime is 644420731. The reversal of 644420714 is 417024446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526307 + ... + 527529.

It is an arithmetic number, because the mean of its divisors is an integer number (35174088).

Almost surely, 2^644420714 is an apocalyptic number.

644420714 is a deficient number, since it is larger than the sum of its proper divisors (481150102).

644420714 is a wasteful number, since it uses less digits than its factorization.

644420714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 644420714 is about 25385.4429545754. The cubic root of 644420714 is about 863.7535206912.

The spelling of 644420714 in words is "six hundred forty-four million, four hundred twenty thousand, seven hundred fourteen".