85688389 has 2 divisors, whose sum is σ = 85688390. Its totient is φ = 85688388.

The previous prime is 85688341. The next prime is 85688443. The reversal of 85688389 is 98388658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55383364 + 30305025 = 7442^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 85688389 - 2¹⁵ = 85655621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85688329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42844194 + 42844195.

It is an arithmetic number, because the mean of its divisors is an integer number (42844195).

Almost surely, 2^85688389 is an apocalyptic number.

It is an amenable number.

85688389 is a deficient number, since it is larger than the sum of its proper divisors (1).

85688389 is an equidigital number, since it uses as much as digits as its factorization.

85688389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 55.

The square root of 85688389 is about 9256.8023096532. The cubic root of 85688389 is about 440.8667299199.

The spelling of 85688389 in words is "eighty-five million, six hundred eighty-eight thousand, three hundred eighty-nine".