87718969 has 4 divisors (see below), whose sum is σ = 94466596. Its totient is φ = 80971344.

The previous prime is 87718957. The next prime is 87718973. The reversal of 87718969 is 96981778.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6051600 + 81667369 = 2460^2 + 9037^2 .

It is a cyclic number.

It is not a de Polignac number, because 87718969 - 2⁵ = 87718937 is a prime.

It is a super-2 number, since 2×87718969² = 15389235044845922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87718909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3373794 + ... + 3373819.

It is an arithmetic number, because the mean of its divisors is an integer number (23616649).

Almost surely, 2^87718969 is an apocalyptic number.

It is an amenable number.

87718969 is a deficient number, since it is larger than the sum of its proper divisors (6747627).

87718969 is a wasteful number, since it uses less digits than its factorization.

87718969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747626.

The product of its digits is 1524096, while the sum is 55.

The square root of 87718969 is about 9365.8405388945. The cubic root of 87718969 is about 444.3220227660.

The spelling of 87718969 in words is "eighty-seven million, seven hundred eighteen thousand, nine hundred sixty-nine".