7971939280 has 40 divisors (see below), whose sum is σ = 18561033000. Its totient is φ = 3184255488.

The previous prime is 7971939257. The next prime is 7971939293. The reversal of 7971939280 is 829391797.

It can be written as a sum of positive squares in 4 ways, for example, as 99281296 + 7872657984 = 9964^2 + 88728^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13555 + ... + 126994.

It is an arithmetic number, because the mean of its divisors is an integer number (464025825).

Almost surely, 2^7971939280 is an apocalyptic number.

It is an amenable number.

7971939280 is an abundant number, since it is smaller than the sum of its proper divisors (10589093720).

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

7971939280 is a wasteful number, since it uses less digits than its factorization.

7971939280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141271 (or 141265 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 7971939280 is about 89285.7171108571. The cubic root of 7971939280 is about 1997.6588672848.

The spelling of 7971939280 in words is "seven billion, nine hundred seventy-one million, nine hundred thirty-nine thousand, two hundred eighty".