87784817 has 2 divisors, whose sum is σ = 87784818. Its totient is φ = 87784816.

The previous prime is 87784747. The next prime is 87784843. The reversal of 87784817 is 71848778.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79995136 + 7789681 = 8944^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 87784817 - 2²⁰ = 86736241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87784877) 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, 43892408 + 43892409.

It is an arithmetic number, because the mean of its divisors is an integer number (43892409).

Almost surely, 2^87784817 is an apocalyptic number.

It is an amenable number.

87784817 is a deficient number, since it is larger than the sum of its proper divisors (1).

87784817 is an equidigital number, since it uses as much as digits as its factorization.

87784817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 702464, while the sum is 50.

The square root of 87784817 is about 9369.3552072701. The cubic root of 87784817 is about 444.4331746980.

The spelling of 87784817 in words is "eighty-seven million, seven hundred eighty-four thousand, eight hundred seventeen".