669877924 has 9 divisors (see below), whose sum is σ = 1172376961. Its totient is φ = 334913080.

The previous prime is 669877919. The next prime is 669877969. The reversal of 669877924 is 429778966.

The square root of 669877924 is 25882.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 507060324 + 162817600 = 22518^2 + 12760^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45294 + ... + 58234.

Almost surely, 2^669877924 is an apocalyptic number.

669877924 is the 25882-nd square number.

It is an amenable number.

669877924 is a deficient number, since it is larger than the sum of its proper divisors (502499037).

669877924 is an frugal number, since it uses more digits than its factorization.

669877924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25886 (or 12943 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 58.

The cubic root of 669877924 is about 874.9808644523.

The spelling of 669877924 in words is "six hundred sixty-nine million, eight hundred seventy-seven thousand, nine hundred twenty-four".