165665028 has 24 divisors (see below), whose sum is σ = 406897120. Its totient is φ = 52315200.

The previous prime is 165665011. The next prime is 165665053. The reversal of 165665028 is 820566561.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363073 + ... + 363528.

Almost surely, 2^165665028 is an apocalyptic number.

It is an amenable number.

165665028 is an abundant number, since it is smaller than the sum of its proper divisors (241232092).

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

165665028 is a wasteful number, since it uses less digits than its factorization.

165665028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726627 (or 726625 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 165665028 is about 12871.0927275038. The cubic root of 165665028 is about 549.2165462383.

The spelling of 165665028 in words is "one hundred sixty-five million, six hundred sixty-five thousand, twenty-eight".