669794520 has 64 divisors (see below), whose sum is σ = 2011212000. Its totient is φ = 178449408.

The previous prime is 669794519. The next prime is 669794533. The reversal of 669794520 is 25497966.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 669794520.

It is a congruent number.

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, 191346 + ... + 194814.

Almost surely, 2^669794520 is an apocalyptic number.

669794520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669794520 is an abundant number, since it is smaller than the sum of its proper divisors (1341417480).

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

669794520 is a wasteful number, since it uses less digits than its factorization.

669794520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092 (or 5088 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 669794520 is about 25880.3887142369. The cubic root of 669794520 is about 874.9445494112.

The spelling of 669794520 in words is "six hundred sixty-nine million, seven hundred ninety-four thousand, five hundred twenty".