665288706 has 32 divisors (see below), whose sum is σ = 1388966400. Its totient is φ = 212192640.

The previous prime is 665288683. The next prime is 665288707. The reversal of 665288706 is 607882566.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (665288707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3541 + ... + 36648.

It is an arithmetic number, because the mean of its divisors is an integer number (43405200).

Almost surely, 2^665288706 is an apocalyptic number.

665288706 is an abundant number, since it is smaller than the sum of its proper divisors (723677694).

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

665288706 is a wasteful number, since it uses less digits than its factorization.

665288706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40314.

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 665288706 is about 25793.1910782671. The cubic root of 665288706 is about 872.9781698164.

The spelling of 665288706 in words is "six hundred sixty-five million, two hundred eighty-eight thousand, seven hundred six".