500642640 has 80 divisors (see below), whose sum is σ = 1724443200. Its totient is φ = 133504128.

The previous prime is 500642627. The next prime is 500642669. The reversal of 500642640 is 46246005.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 113730 + ... + 118049.

It is an arithmetic number, because the mean of its divisors is an integer number (21555540).

Almost surely, 2^500642640 is an apocalyptic number.

It is an amenable number.

500642640 is an abundant number, since it is smaller than the sum of its proper divisors (1223800560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

500642640 is a wasteful number, since it uses less digits than its factorization.

500642640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231801 (or 231789 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 500642640 is about 22375.0450278877. The cubic root of 500642640 is about 794.0404228755.

Adding to 500642640 its reverse (46246005), we get a palindrome (546888645).

The spelling of 500642640 in words is "five hundred million, six hundred forty-two thousand, six hundred forty".