7979987717 has 8 divisors (see below), whose sum is σ = 8634564960. Its totient is φ = 7331229360.

The previous prime is 7979987689. The next prime is 7979987777. The reversal of 7979987717 is 7177899797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7979987717 - 2⁸ = 7979987461 is a prime.

It is a super-3 number, since 3×7979987717³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7979987777) 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, 1451867 + ... + 1457352.

It is an arithmetic number, because the mean of its divisors is an integer number (1079320620).

Almost surely, 2^7979987717 is an apocalyptic number.

It is an amenable number.

7979987717 is a deficient number, since it is larger than the sum of its proper divisors (654577243).

7979987717 is a wasteful number, since it uses less digits than its factorization.

7979987717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909443.

The product of its digits is 98018424, while the sum is 71.

The square root of 7979987717 is about 89330.7769864340. The cubic root of 7979987717 is about 1998.3309172188.

The spelling of 7979987717 in words is "seven billion, nine hundred seventy-nine million, nine hundred eighty-seven thousand, seven hundred seventeen".