7997976081 has 12 divisors (see below), whose sum is σ = 11569121460. Its totient is φ = 5324373600.

The previous prime is 7997976061. The next prime is 7997976083. The reversal of 7997976081 is 1806797997.

It can be written as a sum of positive squares in 2 ways, for example, as 6274065681 + 1723910400 = 79209^2 + 41520^2 .

It is not a de Polignac number, because 7997976081 - 2¹⁵ = 7997943313 is a prime.

It is a super-2 number, since 2×7997976081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7997976083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627546 + ... + 640163.

It is an arithmetic number, because the mean of its divisors is an integer number (964093455).

Almost surely, 2^7997976081 is an apocalyptic number.

It is an amenable number.

7997976081 is a deficient number, since it is larger than the sum of its proper divisors (3571145379).

7997976081 is a wasteful number, since it uses less digits than its factorization.

7997976081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268416 (or 1268413 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 63.

The square root of 7997976081 is about 89431.4043331536. The cubic root of 7997976081 is about 1999.8313258583.

The spelling of 7997976081 in words is "seven billion, nine hundred ninety-seven million, nine hundred seventy-six thousand, eighty-one".