665290028 has 12 divisors (see below), whose sum is σ = 1253815920. Its totient is φ = 307056912.

The previous prime is 665289979. The next prime is 665290033. The reversal of 665290028 is 820092566.

665290028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665290028² = 885221642712481568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665289973 and 665290000.

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, 6396968 + ... + 6397071.

It is an arithmetic number, because the mean of its divisors is an integer number (104484660).

Almost surely, 2^665290028 is an apocalyptic number.

It is an amenable number.

665290028 is a deficient number, since it is larger than the sum of its proper divisors (588525892).

665290028 is a wasteful number, since it uses less digits than its factorization.

665290028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12794056 (or 12794054 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 665290028 is about 25793.2167051727. The cubic root of 665290028 is about 872.9787480497.

The spelling of 665290028 in words is "six hundred sixty-five million, two hundred ninety thousand, twenty-eight".