669593728 has 32 divisors (see below), whose sum is σ = 1336201020. Its totient is φ = 334233600.

The previous prime is 669593693. The next prime is 669593737. The reversal of 669593728 is 827395966.

It can be written as a sum of positive squares in 2 ways, for example, as 650862144 + 18731584 = 25512^2 + 4328^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 77968 + ... + 86128.

Almost surely, 2^669593728 is an apocalyptic number.

It is an amenable number.

669593728 is a deficient number, since it is larger than the sum of its proper divisors (666607292).

669593728 is an equidigital number, since it uses as much as digits as its factorization.

669593728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8816 (or 8804 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 55.

The square root of 669593728 is about 25876.5091927022. The cubic root of 669593728 is about 874.8571099458.

The spelling of 669593728 in words is "six hundred sixty-nine million, five hundred ninety-three thousand, seven hundred twenty-eight".