669688980 has 48 divisors (see below), whose sum is σ = 1878085440. Its totient is φ = 178302208.

The previous prime is 669688979. The next prime is 669689021. The reversal of 669688980 is 89886966.

669688980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 31072 + ... + 48008.

It is an arithmetic number, because the mean of its divisors is an integer number (39126780).

Almost surely, 2^669688980 is an apocalyptic number.

669688980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669688980 is an abundant number, since it is smaller than the sum of its proper divisors (1208396460).

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

669688980 is a wasteful number, since it uses less digits than its factorization.

669688980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17608 (or 17606 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 60.

The square root of 669688980 is about 25878.3496382594. The cubic root of 669688980 is about 874.8985917852.

The spelling of 669688980 in words is "six hundred sixty-nine million, six hundred eighty-eight thousand, nine hundred eighty".