7997590987 has 4 divisors (see below), whose sum is σ = 8072334936. Its totient is φ = 7922847040.

The previous prime is 7997590957. The next prime is 7997591009. The reversal of 7997590987 is 7890957997.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7997590987 - 2⁷ = 7997590859 is a prime.

It is a super-2 number, since 2×7997590987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7997590907) 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 3 ways as a sum of consecutive naturals, for example, 37371814 + ... + 37372027.

It is an arithmetic number, because the mean of its divisors is an integer number (2018083734).

Almost surely, 2^7997590987 is an apocalyptic number.

7997590987 is a deficient number, since it is larger than the sum of its proper divisors (74743949).

7997590987 is a wasteful number, since it uses less digits than its factorization.

7997590987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74743948.

The product of its (nonzero) digits is 90016920, while the sum is 70.

The square root of 7997590987 is about 89429.2512939698. The cubic root of 7997590987 is about 1999.7992287628.

The spelling of 7997590987 in words is "seven billion, nine hundred ninety-seven million, five hundred ninety thousand, nine hundred eighty-seven".