7990665 has 16 divisors (see below), whose sum is σ = 13003200. Its totient is φ = 4188992.

The previous prime is 7990649. The next prime is 7990667. The reversal of 7990665 is 5660997.

It is a cyclic number.

It is not a de Polignac number, because 7990665 - 2⁴ = 7990649 is a prime.

It is a Smith number, since the sum of its digits (42) 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 (7990667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3630 + ... + 5399.

It is an arithmetic number, because the mean of its divisors is an integer number (812700).

Almost surely, 2^7990665 is an apocalyptic number.

It is an amenable number.

7990665 is a deficient number, since it is larger than the sum of its proper divisors (5012535).

7990665 is a wasteful number, since it uses less digits than its factorization.

7990665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9096.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 7990665 is about 2826.7764326172. The cubic root of 7990665 is about 199.9221780560.

The spelling of 7990665 in words is "seven million, nine hundred ninety thousand, six hundred sixty-five".