87680809 has 2 divisors, whose sum is σ = 87680810. Its totient is φ = 87680808.

The previous prime is 87680771. The next prime is 87680821. The reversal of 87680809 is 90808678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65853225 + 21827584 = 8115^2 + 4672^2 .

It is a cyclic number.

It is not a de Polignac number, because 87680809 - 2²⁵ = 54126377 is a prime.

It is not a weakly prime, because it can be changed into another prime (87680869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43840404 + 43840405.

It is an arithmetic number, because the mean of its divisors is an integer number (43840405).

Almost surely, 2^87680809 is an apocalyptic number.

It is an amenable number.

87680809 is a deficient number, since it is larger than the sum of its proper divisors (1).

87680809 is an equidigital number, since it uses as much as digits as its factorization.

87680809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 87680809 is about 9363.8031269351. The cubic root of 87680809 is about 444.2575829311.

The spelling of 87680809 in words is "eighty-seven million, six hundred eighty thousand, eight hundred nine".