7978128 has 40 divisors (see below), whose sum is σ = 20909376. Its totient is φ = 2620800.

The previous prime is 7978099. The next prime is 7978169. The reversal of 7978128 is 8218797.

7978128 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 7978128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2238 + ... + 4578.

Almost surely, 2^7978128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7978128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10454688).

7978128 is an abundant number, since it is smaller than the sum of its proper divisors (12931248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7978128 is a wasteful number, since it uses less digits than its factorization.

7978128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423 (or 2417 counting only the distinct ones).

The product of its digits is 56448, while the sum is 42.

The square root of 7978128 is about 2824.5580185225. The cubic root of 7978128 is about 199.8175669749.

The spelling of 7978128 in words is "seven million, nine hundred seventy-eight thousand, one hundred twenty-eight".