669409392 has 40 divisors (see below), whose sum is σ = 1730404624. Its totient is φ = 222994944.

The previous prime is 669409379. The next prime is 669409397. The reversal of 669409392 is 293904966.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669409397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95148 + ... + 101940.

Almost surely, 2^669409392 is an apocalyptic number.

It is an amenable number.

669409392 is an abundant number, since it is smaller than the sum of its proper divisors (1060995232).

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

669409392 is a wasteful number, since it uses less digits than its factorization.

669409392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8857 (or 8851 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 48.

The square root of 669409392 is about 25872.9471069687. The cubic root of 669409392 is about 874.7768212302.

The spelling of 669409392 in words is "six hundred sixty-nine million, four hundred nine thousand, three hundred ninety-two".