87940717 has 2 divisors, whose sum is σ = 87940718. Its totient is φ = 87940716.

The previous prime is 87940709. The next prime is 87940733. The reversal of 87940717 is 71704978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70123876 + 17816841 = 8374^2 + 4221^2 .

It is a cyclic number.

It is not a de Polignac number, because 87940717 - 2³ = 87940709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87940217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43970358 + 43970359.

It is an arithmetic number, because the mean of its divisors is an integer number (43970359).

Almost surely, 2^87940717 is an apocalyptic number.

It is an amenable number.

87940717 is a deficient number, since it is larger than the sum of its proper divisors (1).

87940717 is an equidigital number, since it uses as much as digits as its factorization.

87940717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 87940717 is about 9377.6711927856. The cubic root of 87940717 is about 444.6961136977.

The spelling of 87940717 in words is "eighty-seven million, nine hundred forty thousand, seven hundred seventeen".