87936809 has 2 divisors, whose sum is σ = 87936810. Its totient is φ = 87936808.

The previous prime is 87936781. The next prime is 87936811. The reversal of 87936809 is 90863978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71453209 + 16483600 = 8453^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 87936809 - 2²⁰ = 86888233 is a prime.

Together with 87936811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87936899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43968404 + 43968405.

It is an arithmetic number, because the mean of its divisors is an integer number (43968405).

Almost surely, 2^87936809 is an apocalyptic number.

It is an amenable number.

87936809 is a deficient number, since it is larger than the sum of its proper divisors (1).

87936809 is an equidigital number, since it uses as much as digits as its factorization.

87936809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 87936809 is about 9377.4628231734. The cubic root of 87936809 is about 444.6895263124.

The spelling of 87936809 in words is "eighty-seven million, nine hundred thirty-six thousand, eight hundred nine".