7978871736 has 128 divisors (see below), whose sum is σ = 24575212800. Its totient is φ = 2378160000.

The previous prime is 7978871731. The next prime is 7978871759. The reversal of 7978871736 is 6371788797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978871731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117411 + ... + 172461.

It is an arithmetic number, because the mean of its divisors is an integer number (191993850).

Almost surely, 2^7978871736 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 7978871736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12287606400).

7978871736 is an abundant number, since it is smaller than the sum of its proper divisors (16596341064).

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

7978871736 is a wasteful number, since it uses less digits than its factorization.

7978871736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55138 (or 55128 counting only the distinct ones).

The product of its digits is 24893568, while the sum is 63.

The square root of 7978871736 is about 89324.5304269773. The cubic root of 7978871736 is about 1998.2377590428.

The spelling of 7978871736 in words is "seven billion, nine hundred seventy-eight million, eight hundred seventy-one thousand, seven hundred thirty-six".