87718999 has 2 divisors, whose sum is σ = 87719000. Its totient is φ = 87718998.

The previous prime is 87718973. The next prime is 87719003. The reversal of 87718999 is 99981778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87718999 - 2¹⁵ = 87686231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87718909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43859499 + 43859500.

It is an arithmetic number, because the mean of its divisors is an integer number (43859500).

Almost surely, 2^87718999 is an apocalyptic number.

87718999 is a deficient number, since it is larger than the sum of its proper divisors (1).

87718999 is an equidigital number, since it uses as much as digits as its factorization.

87718999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 58.

The square root of 87718999 is about 9365.8421404591. The cubic root of 87718999 is about 444.3220734189.

The spelling of 87718999 in words is "eighty-seven million, seven hundred eighteen thousand, nine hundred ninety-nine".