669712320 has 112 divisors (see below), whose sum is σ = 2362626720. Its totient is φ = 178587648.

The previous prime is 669712319. The next prime is 669712333. The reversal of 669712320 is 23217966.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30117 + ... + 47396.

Almost surely, 2^669712320 is an apocalyptic number.

669712320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669712320 is an abundant number, since it is smaller than the sum of its proper divisors (1692914400).

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

669712320 is a wasteful number, since it uses less digits than its factorization.

669712320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77539 (or 77523 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 669712320 is about 25878.8005904447. The cubic root of 669712320 is about 874.9087556555.

The spelling of 669712320 in words is "six hundred sixty-nine million, seven hundred twelve thousand, three hundred twenty".