669421824 has 36 divisors (see below), whose sum is σ = 1781640336. Its totient is φ = 223140352.

The previous prime is 669421817. The next prime is 669421849. The reversal of 669421824 is 428124966.

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, 435054 + ... + 436589.

Almost surely, 2^669421824 is an apocalyptic number.

669421824 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

669421824 is an abundant number, since it is smaller than the sum of its proper divisors (1112218512).

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

669421824 is an equidigital number, since it uses as much as digits as its factorization.

669421824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871662 (or 871648 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 669421824 is about 25873.1873567985. The cubic root of 669421824 is about 874.7822365302.

The spelling of 669421824 in words is "six hundred sixty-nine million, four hundred twenty-one thousand, eight hundred twenty-four".