7978464988 has 72 divisors (see below), whose sum is σ = 15462510336. Its totient is φ = 3599481600.

The previous prime is 7978464979. The next prime is 7978465013. The reversal of 7978464988 is 8894648797.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7875570 + ... + 7876582.

It is an arithmetic number, because the mean of its divisors is an integer number (214757088).

Almost surely, 2^7978464988 is an apocalyptic number.

It is an amenable number.

7978464988 is a deficient number, since it is larger than the sum of its proper divisors (7484045348).

7978464988 is a wasteful number, since it uses less digits than its factorization.

7978464988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295 (or 1280 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 70.

The square root of 7978464988 is about 89322.2535989772. The cubic root of 7978464988 is about 1998.2038029877.

The spelling of 7978464988 in words is "seven billion, nine hundred seventy-eight million, four hundred sixty-four thousand, nine hundred eighty-eight".