87766517 has 2 divisors, whose sum is σ = 87766518. Its totient is φ = 87766516.

The previous prime is 87766501. The next prime is 87766537. The reversal of 87766517 is 71566778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50140561 + 37625956 = 7081^2 + 6134^2 .

It is a cyclic number.

It is not a de Polignac number, because 87766517 - 2⁴ = 87766501 is a prime.

It is a super-2 number, since 2×87766517² = 15405923012622578, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87766537) 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, 43883258 + 43883259.

It is an arithmetic number, because the mean of its divisors is an integer number (43883259).

Almost surely, 2^87766517 is an apocalyptic number.

It is an amenable number.

87766517 is a deficient number, since it is larger than the sum of its proper divisors (1).

87766517 is an equidigital number, since it uses as much as digits as its factorization.

87766517 is an odious number, because the sum of its binary digits is odd.

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

The square root of 87766517 is about 9368.3785683543. The cubic root of 87766517 is about 444.4022897356.

The spelling of 87766517 in words is "eighty-seven million, seven hundred sixty-six thousand, five hundred seventeen".