7678864 has 20 divisors (see below), whose sum is σ = 14982300. Its totient is φ = 3812480.

The previous prime is 7678861. The next prime is 7678873. The reversal of 7678864 is 4688767.

It can be written as a sum of positive squares in 2 ways, for example, as 3268864 + 4410000 = 1808^2 + 2100^2 .

It is not an unprimeable number, because it can be changed into a prime (7678861) 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 3 ways as a sum of consecutive naturals, for example, 774 + ... + 3994.

It is an arithmetic number, because the mean of its divisors is an integer number (749115).

Almost surely, 2^7678864 is an apocalyptic number.

It is an amenable number.

7678864 is a deficient number, since it is larger than the sum of its proper divisors (7303436).

7678864 is a wasteful number, since it uses less digits than its factorization.

7678864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378 (or 3372 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 7678864 is about 2771.0763251849. The cubic root of 7678864 is about 197.2872376302.

The spelling of 7678864 in words is "seven million, six hundred seventy-eight thousand, eight hundred sixty-four".