669423972 has 24 divisors (see below), whose sum is σ = 1785130816. Its totient is φ = 191263968.

The previous prime is 669423949. The next prime is 669423991. The reversal of 669423972 is 279324966.

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, 3984583 + ... + 3984750.

Almost surely, 2^669423972 is an apocalyptic number.

It is an amenable number.

669423972 is an abundant number, since it is smaller than the sum of its proper divisors (1115706844).

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

669423972 is a wasteful number, since it uses less digits than its factorization.

669423972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7969347 (or 7969345 counting only the distinct ones).

The product of its digits is 979776, while the sum is 48.

The square root of 669423972 is about 25873.2288669196. The cubic root of 669423972 is about 874.7831721786.

The spelling of 669423972 in words is "six hundred sixty-nine million, four hundred twenty-three thousand, nine hundred seventy-two".