85648989 has 4 divisors (see below), whose sum is σ = 114198656. Its totient is φ = 57099324.

The previous prime is 85648967. The next prime is 85648999. The reversal of 85648989 is 98984658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85648989 - 2⁵ = 85648957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85648999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14274829 + ... + 14274834.

It is an arithmetic number, because the mean of its divisors is an integer number (28549664).

Almost surely, 2^85648989 is an apocalyptic number.

It is an amenable number.

85648989 is a deficient number, since it is larger than the sum of its proper divisors (28549667).

85648989 is a wasteful number, since it uses less digits than its factorization.

85648989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28549666.

The product of its digits is 4976640, while the sum is 57.

The square root of 85648989 is about 9254.6739002517. The cubic root of 85648989 is about 440.7991485656.

The spelling of 85648989 in words is "eighty-five million, six hundred forty-eight thousand, nine hundred eighty-nine".