7978138184 has 16 divisors (see below), whose sum is σ = 14998072320. Its totient is φ = 3978652240.

The previous prime is 7978138169. The next prime is 7978138213. The reversal of 7978138184 is 4818318797.

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, 1298852 + ... + 1304979.

It is an arithmetic number, because the mean of its divisors is an integer number (937379520).

Almost surely, 2^7978138184 is an apocalyptic number.

It is an amenable number.

7978138184 is a deficient number, since it is larger than the sum of its proper divisors (7019934136).

7978138184 is a wasteful number, since it uses less digits than its factorization.

7978138184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604220 (or 2604216 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 56.

The square root of 7978138184 is about 89320.4242264892. The cubic root of 7978138184 is about 1998.1765199655.

The spelling of 7978138184 in words is "seven billion, nine hundred seventy-eight million, one hundred thirty-eight thousand, one hundred eighty-four".