7978651576 has 24 divisors (see below), whose sum is σ = 17402416920. Its totient is φ = 3419421936.

The previous prime is 7978651561. The next prime is 7978651579. The reversal of 7978651576 is 6751568797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978651579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10176460 + ... + 10177243.

It is an arithmetic number, because the mean of its divisors is an integer number (725100705).

Almost surely, 2^7978651576 is an apocalyptic number.

It is an amenable number.

7978651576 is an abundant number, since it is smaller than the sum of its proper divisors (9423765344).

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

7978651576 is a wasteful number, since it uses less digits than its factorization.

7978651576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20353723 (or 20353712 counting only the distinct ones).

The product of its digits is 22226400, while the sum is 61.

The square root of 7978651576 is about 89323.2980582334. The cubic root of 7978651576 is about 1998.2193798330.

The spelling of 7978651576 in words is "seven billion, nine hundred seventy-eight million, six hundred fifty-one thousand, five hundred seventy-six".