87389689 has 2 divisors, whose sum is σ = 87389690. Its totient is φ = 87389688.

The previous prime is 87389677. The next prime is 87389693. The reversal of 87389689 is 98698378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79352464 + 8037225 = 8908^2 + 2835^2 .

It is a cyclic number.

It is not a de Polignac number, because 87389689 - 2⁵ = 87389657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87389389) 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, 43694844 + 43694845.

It is an arithmetic number, because the mean of its divisors is an integer number (43694845).

Almost surely, 2^87389689 is an apocalyptic number.

It is an amenable number.

87389689 is a deficient number, since it is larger than the sum of its proper divisors (1).

87389689 is an equidigital number, since it uses as much as digits as its factorization.

87389689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The square root of 87389689 is about 9348.2452364067. The cubic root of 87389689 is about 443.7653594102.

The spelling of 87389689 in words is "eighty-seven million, three hundred eighty-nine thousand, six hundred eighty-nine".