669711872 has 40 divisors (see below), whose sum is σ = 1416846816. Its totient is φ = 315154432.

The previous prime is 669711857. The next prime is 669711899. The reversal of 669711872 is 278117966.

It is a congruent number.

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, 29768 + ... + 47175.

Almost surely, 2^669711872 is an apocalyptic number.

It is an amenable number.

669711872 is an abundant number, since it is smaller than the sum of its proper divisors (747134944).

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

669711872 is an equidigital number, since it uses as much as digits as its factorization.

669711872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76978 (or 76962 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 669711872 is about 25878.7919347098. The cubic root of 669711872 is about 874.9085605672.

The spelling of 669711872 in words is "six hundred sixty-nine million, seven hundred eleven thousand, eight hundred seventy-two".