669390952 has 16 divisors (see below), whose sum is σ = 1255608900. Its totient is φ = 334561920.

The previous prime is 669390949. The next prime is 669390973. The reversal of 669390952 is 259093966.

It can be written as a sum of positive squares in 2 ways, for example, as 420824196 + 248566756 = 20514^2 + 15766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 669390896 and 669390905.

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, 6502 + ... + 37162.

Almost surely, 2^669390952 is an apocalyptic number.

It is an amenable number.

669390952 is a deficient number, since it is larger than the sum of its proper divisors (586217948).

669390952 is a wasteful number, since it uses less digits than its factorization.

669390952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33396 (or 33392 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 49.

The square root of 669390952 is about 25872.5907477392. The cubic root of 669390952 is about 874.7687887601.

The spelling of 669390952 in words is "six hundred sixty-nine million, three hundred ninety thousand, nine hundred fifty-two".