87715787 has 2 divisors, whose sum is σ = 87715788. Its totient is φ = 87715786.

The previous prime is 87715783. The next prime is 87715883. The reversal of 87715787 is 78751778.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87715787 - 2² = 87715783 is a prime.

It is not a weakly prime, because it can be changed into another prime (87715781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43857893 + 43857894.

It is an arithmetic number, because the mean of its divisors is an integer number (43857894).

Almost surely, 2^87715787 is an apocalyptic number.

87715787 is a deficient number, since it is larger than the sum of its proper divisors (1).

87715787 is an equidigital number, since it uses as much as digits as its factorization.

87715787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768320, while the sum is 50.

The square root of 87715787 is about 9365.6706647202. The cubic root of 87715787 is about 444.3166501167.

The spelling of 87715787 in words is "eighty-seven million, seven hundred fifteen thousand, seven hundred eighty-seven".