87656717 has 2 divisors, whose sum is σ = 87656718. Its totient is φ = 87656716.

The previous prime is 87656693. The next prime is 87656759. The reversal of 87656717 is 71765678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 2758921 = 9214^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 87656717 - 2⁸ = 87656461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87655717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43828358 + 43828359.

It is an arithmetic number, because the mean of its divisors is an integer number (43828359).

Almost surely, 2^87656717 is an apocalyptic number.

It is an amenable number.

87656717 is a deficient number, since it is larger than the sum of its proper divisors (1).

87656717 is an equidigital number, since it uses as much as digits as its factorization.

87656717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 47.

The square root of 87656717 is about 9362.5165954459. The cubic root of 87656717 is about 444.2168897461.

It can be divided in two parts, 8765671 and 7, that added together give a palindrome (8765678).

The spelling of 87656717 in words is "eighty-seven million, six hundred fifty-six thousand, seven hundred seventeen".