7975997856 has 48 divisors (see below), whose sum is σ = 23263329600. Its totient is φ = 2658665664.

The previous prime is 7975997851. The next prime is 7975997873. The reversal of 7975997856 is 6587995797.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (7975997851) 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, 4614876 + ... + 4616603.

It is an arithmetic number, because the mean of its divisors is an integer number (484652700).

Almost surely, 2^7975997856 is an apocalyptic number.

It is an amenable number.

7975997856 is an abundant number, since it is smaller than the sum of its proper divisors (15287331744).

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

7975997856 is a wasteful number, since it uses less digits than its factorization.

7975997856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9231498 (or 9231484 counting only the distinct ones).

The product of its digits is 300056400, while the sum is 72.

The square root of 7975997856 is about 89308.4422437207. The cubic root of 7975997856 is about 1997.9978176351.

The spelling of 7975997856 in words is "seven billion, nine hundred seventy-five million, nine hundred ninety-seven thousand, eight hundred fifty-six".