669494320 has 80 divisors (see below), whose sum is σ = 1734317568. Its totient is φ = 238257920.

The previous prime is 669494311. The next prime is 669494333. The reversal of 669494320 is 23494966.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33267 + ... + 49453.

Almost surely, 2^669494320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669494320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (867158784).

669494320 is an abundant number, since it is smaller than the sum of its proper divisors (1064823248).

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

669494320 is a wasteful number, since it uses less digits than its factorization.

669494320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16258 (or 16252 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 669494320 is about 25874.5883059035. The cubic root of 669494320 is about 874.8138139908.

The spelling of 669494320 in words is "six hundred sixty-nine million, four hundred ninety-four thousand, three hundred twenty".