669540328 has 16 divisors (see below), whose sum is σ = 1256477760. Its totient is φ = 334479600.

The previous prime is 669540307. The next prime is 669540341. The reversal of 669540328 is 823045966.

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, 26368 + ... + 45103.

It is an arithmetic number, because the mean of its divisors is an integer number (78529860).

Almost surely, 2^669540328 is an apocalyptic number.

It is an amenable number.

669540328 is a deficient number, since it is larger than the sum of its proper divisors (586937432).

669540328 is a wasteful number, since it uses less digits than its factorization.

669540328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72648 (or 72644 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 669540328 is about 25875.4773482539. The cubic root of 669540328 is about 874.8338527529.

The spelling of 669540328 in words is "six hundred sixty-nine million, five hundred forty thousand, three hundred twenty-eight".