644504014 has 32 divisors (see below), whose sum is σ = 1216601856. Its totient is φ = 248752320.

The previous prime is 644503973. The next prime is 644504027. The reversal of 644504014 is 410405446.

It is a super-2 number, since 2×644504014² = 830770848124224392, which contains 22 as substring.

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, 3079 + ... + 36034.

It is an arithmetic number, because the mean of its divisors is an integer number (38018808).

Almost surely, 2^644504014 is an apocalyptic number.

644504014 is a deficient number, since it is larger than the sum of its proper divisors (572097842).

644504014 is a wasteful number, since it uses less digits than its factorization.

644504014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39240.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 644504014 is about 25387.0836056448. The cubic root of 644504014 is about 863.7907363210.

The spelling of 644504014 in words is "six hundred forty-four million, five hundred four thousand, fourteen".