8001297640 has 64 divisors (see below), whose sum is σ = 20963007360. Its totient is φ = 2691536640.

The previous prime is 8001297631. The next prime is 8001297653. The reversal of 8001297640 is 467921008.

It is a self number, because there is not a number n which added to its sum of digits gives 8001297640.

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, 254746 + ... + 284425.

It is an arithmetic number, because the mean of its divisors is an integer number (327546990).

Almost surely, 2^8001297640 is an apocalyptic number.

It is an amenable number.

8001297640 is an abundant number, since it is smaller than the sum of its proper divisors (12961709720).

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

8001297640 is a wasteful number, since it uses less digits than its factorization.

8001297640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539242 (or 539238 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 8001297640 is about 89449.9728339813. The cubic root of 8001297640 is about 2000.1081308204.

The spelling of 8001297640 in words is "eight billion, one million, two hundred ninety-seven thousand, six hundred forty".