86628389 has 2 divisors, whose sum is σ = 86628390. Its totient is φ = 86628388.

The previous prime is 86628337. The next prime is 86628397. The reversal of 86628389 is 98382668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69472225 + 17156164 = 8335^2 + 4142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86628389 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86628329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43314194 + 43314195.

It is an arithmetic number, because the mean of its divisors is an integer number (43314195).

Almost surely, 2^86628389 is an apocalyptic number.

It is an amenable number.

86628389 is a deficient number, since it is larger than the sum of its proper divisors (1).

86628389 is an equidigital number, since it uses as much as digits as its factorization.

86628389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The square root of 86628389 is about 9307.4372949808. The cubic root of 86628389 is about 442.4729705685.

The spelling of 86628389 in words is "eighty-six million, six hundred twenty-eight thousand, three hundred eighty-nine".