7978682544 has 120 divisors (see below), whose sum is σ = 24166453248. Its totient is φ = 2261589120.

The previous prime is 7978682531. The next prime is 7978682549. The reversal of 7978682544 is 4452868797.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (7978682549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285349 + ... + 312059.

Almost surely, 2^7978682544 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 7978682544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12083226624).

7978682544 is an abundant number, since it is smaller than the sum of its proper divisors (16187770704).

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

7978682544 is a wasteful number, since it uses less digits than its factorization.

7978682544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26863 (or 26850 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 60.

The square root of 7978682544 is about 89323.4714058964. The cubic root of 7978682544 is about 1998.2219650977.

The spelling of 7978682544 in words is "seven billion, nine hundred seventy-eight million, six hundred eighty-two thousand, five hundred forty-four".