500644639 has 6 divisors (see below), whose sum is σ = 550295480. Its totient is φ = 455131380.

The previous prime is 500644633. The next prime is 500644649. The reversal of 500644639 is 936446005.

It is a happy number.

It is not a de Polignac number, because 500644639 - 2³ = 500644631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 500644598 and 500644607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500644631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2068659 + ... + 2068900.

Almost surely, 2^500644639 is an apocalyptic number.

500644639 is a deficient number, since it is larger than the sum of its proper divisors (49650841).

500644639 is a wasteful number, since it uses less digits than its factorization.

500644639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4137581 (or 4137570 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 500644639 is about 22375.0896981442. The cubic root of 500644639 is about 794.0414797069.

The spelling of 500644639 in words is "five hundred million, six hundred forty-four thousand, six hundred thirty-nine".