87816857 has 2 divisors, whose sum is σ = 87816858. Its totient is φ = 87816856.

The previous prime is 87816853. The next prime is 87816871. The reversal of 87816857 is 75861878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67059721 + 20757136 = 8189^2 + 4556^2 .

It is a cyclic number.

It is not a de Polignac number, because 87816857 - 2² = 87816853 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87816853) 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, 43908428 + 43908429.

It is an arithmetic number, because the mean of its divisors is an integer number (43908429).

Almost surely, 2^87816857 is an apocalyptic number.

It is an amenable number.

87816857 is a deficient number, since it is larger than the sum of its proper divisors (1).

87816857 is an equidigital number, since it uses as much as digits as its factorization.

87816857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 50.

The square root of 87816857 is about 9371.0648807913. The cubic root of 87816857 is about 444.4872383632.

The spelling of 87816857 in words is "eighty-seven million, eight hundred sixteen thousand, eight hundred fifty-seven".