7978856 has 8 divisors (see below), whose sum is σ = 14960370. Its totient is φ = 3989424.

The previous prime is 7978849. The next prime is 7978871. The reversal of 7978856 is 6588797.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7474756 + 504100 = 2734^2 + 710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498671 + ... + 498686.

Almost surely, 2^7978856 is an apocalyptic number.

It is an amenable number.

7978856 is a deficient number, since it is larger than the sum of its proper divisors (6981514).

7978856 is a wasteful number, since it uses less digits than its factorization.

7978856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997363 (or 997359 counting only the distinct ones).

The product of its digits is 846720, while the sum is 50.

The square root of 7978856 is about 2824.6868853025. The cubic root of 7978856 is about 199.8236445395.

The spelling of 7978856 in words is "seven million, nine hundred seventy-eight thousand, eight hundred fifty-six".