7957881680 has 80 divisors (see below), whose sum is σ = 21275197824. Its totient is φ = 2711646720.

The previous prime is 7957881643. The next prime is 7957881707. The reversal of 7957881680 is 861887597.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47690 + ... + 134870.

Almost surely, 2^7957881680 is an apocalyptic number.

7957881680 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7957881680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10637598912).

7957881680 is an abundant number, since it is smaller than the sum of its proper divisors (13317316144).

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

7957881680 is a wasteful number, since it uses less digits than its factorization.

7957881680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87364 (or 87358 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 59.

The square root of 7957881680 is about 89206.9598181667. The cubic root of 7957881680 is about 1996.4839623619.

The spelling of 7957881680 in words is "seven billion, nine hundred fifty-seven million, eight hundred eighty-one thousand, six hundred eighty".