87204809 has 2 divisors, whose sum is σ = 87204810. Its totient is φ = 87204808.

The previous prime is 87204797. The next prime is 87204841. The reversal of 87204809 is 90840278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72726784 + 14478025 = 8528^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 87204809 - 2⁸ = 87204553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87204899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43602404 + 43602405.

It is an arithmetic number, because the mean of its divisors is an integer number (43602405).

Almost surely, 2^87204809 is an apocalyptic number.

It is an amenable number.

87204809 is a deficient number, since it is larger than the sum of its proper divisors (1).

87204809 is an equidigital number, since it uses as much as digits as its factorization.

87204809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 87204809 is about 9338.3515140521. The cubic root of 87204809 is about 443.4521978876.

The spelling of 87204809 in words is "eighty-seven million, two hundred four thousand, eight hundred nine".