7981631680 has 56 divisors (see below), whose sum is σ = 20734111440. Its totient is φ = 2902410240.

The previous prime is 7981631657. The next prime is 7981631683. The reversal of 7981631680 is 861361897.

It is not an unprimeable number, because it can be changed into a prime (7981631683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130235 + ... + 1137274.

It is an arithmetic number, because the mean of its divisors is an integer number (370251990).

Almost surely, 2^7981631680 is an apocalyptic number.

It is an amenable number.

7981631680 is an abundant number, since it is smaller than the sum of its proper divisors (12752479760).

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

7981631680 is a wasteful number, since it uses less digits than its factorization.

7981631680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267537 (or 2267527 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 7981631680 is about 89339.9780613360. The cubic root of 7981631680 is about 1998.4681336590.

The spelling of 7981631680 in words is "seven billion, nine hundred eighty-one million, six hundred thirty-one thousand, six hundred eighty".