669680980 has 12 divisors (see below), whose sum is σ = 1406330100. Its totient is φ = 267872384.

The previous prime is 669680951. The next prime is 669680989. The reversal of 669680980 is 89086966.

669680980 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 436141456 + 233539524 = 20884^2 + 15282^2 .

It is a super-2 number, since 2×669680980² = 896945229947520800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669680989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16742005 + ... + 16742044.

It is an arithmetic number, because the mean of its divisors is an integer number (117194175).

Almost surely, 2^669680980 is an apocalyptic number.

It is an amenable number.

669680980 is an abundant number, since it is smaller than the sum of its proper divisors (736649120).

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

669680980 is a wasteful number, since it uses less digits than its factorization.

669680980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33484058 (or 33484056 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 669680980 is about 25878.1950684355. The cubic root of 669680980 is about 874.8951079706.

The spelling of 669680980 in words is "six hundred sixty-nine million, six hundred eighty thousand, nine hundred eighty".