87918817 has 4 divisors (see below), whose sum is σ = 100478656. Its totient is φ = 75358980.

The previous prime is 87918793. The next prime is 87918827. The reversal of 87918817 is 71881978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87918817 - 2¹¹ = 87916769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87918827) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6279909 + ... + 6279922.

It is an arithmetic number, because the mean of its divisors is an integer number (25119664).

Almost surely, 2^87918817 is an apocalyptic number.

It is an amenable number.

87918817 is a deficient number, since it is larger than the sum of its proper divisors (12559839).

87918817 is a wasteful number, since it uses less digits than its factorization.

87918817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12559838.

The product of its digits is 225792, while the sum is 49.

The square root of 87918817 is about 9376.5034527803. The cubic root of 87918817 is about 444.6591962009.

The spelling of 87918817 in words is "eighty-seven million, nine hundred eighteen thousand, eight hundred seventeen".