87765289 has 2 divisors, whose sum is σ = 87765290. Its totient is φ = 87765288.

The previous prime is 87765283. The next prime is 87765299. The reversal of 87765289 is 98256778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68475625 + 19289664 = 8275^2 + 4392^2 .

It is a cyclic number.

It is not a de Polignac number, because 87765289 - 2¹⁵ = 87732521 is a prime.

It is not a weakly prime, because it can be changed into another prime (87765283) 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, 43882644 + 43882645.

It is an arithmetic number, because the mean of its divisors is an integer number (43882645).

Almost surely, 2^87765289 is an apocalyptic number.

It is an amenable number.

87765289 is a deficient number, since it is larger than the sum of its proper divisors (1).

87765289 is an equidigital number, since it uses as much as digits as its factorization.

87765289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 52.

The square root of 87765289 is about 9368.3130285020. The cubic root of 87765289 is about 444.4002170828.

It can be divided in two parts, 877 and 65289, that added together give a palindrome (66166).

The spelling of 87765289 in words is "eighty-seven million, seven hundred sixty-five thousand, two hundred eighty-nine".