85890813 has 4 divisors (see below), whose sum is σ = 114521088. Its totient is φ = 57260540.

The previous prime is 85890799. The next prime is 85890821. The reversal of 85890813 is 31809858.

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 a cyclic number.

It is not a de Polignac number, because 85890813 - 2⁵ = 85890781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85890113) 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 in 3 ways as a sum of consecutive naturals, for example, 14315133 + ... + 14315138.

It is an arithmetic number, because the mean of its divisors is an integer number (28630272).

Almost surely, 2^85890813 is an apocalyptic number.

It is an amenable number.

85890813 is a deficient number, since it is larger than the sum of its proper divisors (28630275).

85890813 is a wasteful number, since it uses less digits than its factorization.

85890813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28630274.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 85890813 is about 9267.7296572569. The cubic root of 85890813 is about 441.2136140471.

The spelling of 85890813 in words is "eighty-five million, eight hundred ninety thousand, eight hundred thirteen".