669908280 has 32 divisors (see below), whose sum is σ = 2009725200. Its totient is φ = 178642176.

The previous prime is 669908263. The next prime is 669908299. The reversal of 669908280 is 82809966.

It is a super-2 number, since 2×669908280² = 897554207225116800, 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 7 ways as a sum of consecutive naturals, for example, 2791165 + ... + 2791404.

Almost surely, 2^669908280 is an apocalyptic number.

669908280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669908280 is an abundant number, since it is smaller than the sum of its proper divisors (1339816920).

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

669908280 is a wasteful number, since it uses less digits than its factorization.

669908280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582583 (or 5582579 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 669908280 is about 25882.5864240806. The cubic root of 669908280 is about 874.9940810484.

The spelling of 669908280 in words is "six hundred sixty-nine million, nine hundred eight thousand, two hundred eighty".