7890645 has 16 divisors (see below), whose sum is σ = 14428800. Its totient is φ = 3607104.

The previous prime is 7890611. The next prime is 7890661. The reversal of 7890645 is 5460987.

It is not a de Polignac number, because 7890645 - 2⁷ = 7890517 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37470 + ... + 37679.

It is an arithmetic number, because the mean of its divisors is an integer number (901800).

Almost surely, 2^7890645 is an apocalyptic number.

It is an amenable number.

7890645 is a deficient number, since it is larger than the sum of its proper divisors (6538155).

7890645 is a wasteful number, since it uses less digits than its factorization.

7890645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75164.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 7890645 is about 2809.0291917315. The cubic root of 7890645 is about 199.0845242479.

The spelling of 7890645 in words is "seven million, eight hundred ninety thousand, six hundred forty-five".