87999717 has 24 divisors (see below), whose sum is σ = 130914784. Its totient is φ = 52266816.

The previous prime is 87999707. The next prime is 87999721. The reversal of 87999717 is 71799978.

It is not a de Polignac number, because 87999717 - 2⁷ = 87999589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87999707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31458 + ... + 34140.

Almost surely, 2^87999717 is an apocalyptic number.

87999717 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

87999717 is a deficient number, since it is larger than the sum of its proper divisors (42915067).

87999717 is a wasteful number, since it uses less digits than its factorization.

87999717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757 (or 2728 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 57.

The square root of 87999717 is about 9380.8164356840. The cubic root of 87999717 is about 444.7955413055.

It can be divided in two parts, 8799971 and 7, that added together give a palindrome (8799978).

The spelling of 87999717 in words is "eighty-seven million, nine hundred ninety-nine thousand, seven hundred seventeen".