7978928 has 20 divisors (see below), whose sum is σ = 15837528. Its totient is φ = 3891840.

The previous prime is 7978913. The next prime is 7978937. The reversal of 7978928 is 8298797.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5426 + ... + 6737.

Almost surely, 2^7978928 is an apocalyptic number.

It is an amenable number.

7978928 is a deficient number, since it is larger than the sum of its proper divisors (7858600).

7978928 is a wasteful number, since it uses less digits than its factorization.

7978928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12212 (or 12206 counting only the distinct ones).

The product of its digits is 508032, while the sum is 50.

The square root of 7978928 is about 2824.6996300492. The cubic root of 7978928 is about 199.8242455972.

The spelling of 7978928 in words is "seven million, nine hundred seventy-eight thousand, nine hundred twenty-eight".