7678645 has 16 divisors (see below), whose sum is σ = 10508400. Its totient is φ = 5336064.

The previous prime is 7678637. The next prime is 7678661. The reversal of 7678645 is 5468767.

It can be written as a sum of positive squares in 8 ways, for example, as 66564 + 7612081 = 258^2 + 2759^2 .

It is a cyclic number.

It is not a de Polignac number, because 7678645 - 2³ = 7678637 is a prime.

7678645 is a lucky 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, 2370 + ... + 4579.

It is an arithmetic number, because the mean of its divisors is an integer number (656775).

Almost surely, 2^7678645 is an apocalyptic number.

It is an amenable number.

7678645 is a deficient number, since it is larger than the sum of its proper divisors (2829755).

7678645 is a wasteful number, since it uses less digits than its factorization.

7678645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6984.

The product of its digits is 282240, while the sum is 43.

The square root of 7678645 is about 2771.0368095715. The cubic root of 7678645 is about 197.2853620787.

The spelling of 7678645 in words is "seven million, six hundred seventy-eight thousand, six hundred forty-five".