669898028 has 12 divisors (see below), whose sum is σ = 1212746640. Its totient is φ = 323398992.

The previous prime is 669898007. The next prime is 669898081. The reversal of 669898028 is 820898966.

It is a hoax number, since the sum of its digits (56) 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 3 ways as a sum of consecutive naturals, for example, 2887376 + ... + 2887607.

It is an arithmetic number, because the mean of its divisors is an integer number (101062220).

Almost surely, 2^669898028 is an apocalyptic number.

It is an amenable number.

669898028 is a deficient number, since it is larger than the sum of its proper divisors (542848612).

669898028 is a wasteful number, since it uses less digits than its factorization.

669898028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775016 (or 5775014 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 56.

The square root of 669898028 is about 25882.3883751094. The cubic root of 669898028 is about 874.9896175095.

The spelling of 669898028 in words is "six hundred sixty-nine million, eight hundred ninety-eight thousand, twenty-eight".