669508880 has 20 divisors (see below), whose sum is σ = 1556608332. Its totient is φ = 267803520.

The previous prime is 669508849. The next prime is 669508897. The reversal of 669508880 is 88805966.

It can be written as a sum of positive squares in 2 ways, for example, as 265820416 + 403688464 = 16304^2 + 20092^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4184351 + ... + 4184510.

Almost surely, 2^669508880 is an apocalyptic number.

It is an amenable number.

669508880 is an abundant number, since it is smaller than the sum of its proper divisors (887099452).

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

669508880 is a wasteful number, since it uses less digits than its factorization.

669508880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368874 (or 8368868 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 669508880 is about 25874.8696615075. The cubic root of 669508880 is about 874.8201556911.

The spelling of 669508880 in words is "six hundred sixty-nine million, five hundred eight thousand, eight hundred eighty".