7999128720 has 120 divisors (see below), whose sum is σ = 29305927872. Its totient is φ = 1939180800.

The previous prime is 7999128713. The next prime is 7999128733. The reversal of 7999128720 is 278219997.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497076 + ... + 512915.

Almost surely, 2^7999128720 is an apocalyptic number.

It is an amenable number.

7999128720 is an abundant number, since it is smaller than the sum of its proper divisors (21306799152).

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

7999128720 is a wasteful number, since it uses less digits than its factorization.

7999128720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010021 (or 1010012 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 7999128720 is about 89437.8483641014. The cubic root of 7999128720 is about 1999.9273906973.

The spelling of 7999128720 in words is "seven billion, nine hundred ninety-nine million, one hundred twenty-eight thousand, seven hundred twenty".