85391244 has 72 divisors (see below), whose sum is σ = 229232640. Its totient is φ = 26726112.

The previous prime is 85391237. The next prime is 85391297. The reversal of 85391244 is 44219358.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 85391199 and 85391208.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86377 + ... + 87359.

Almost surely, 2^85391244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85391244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114616320).

85391244 is an abundant number, since it is smaller than the sum of its proper divisors (143841396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85391244 is a wasteful number, since it uses less digits than its factorization.

85391244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1134 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 85391244 is about 9240.7382821937. The cubic root of 85391244 is about 440.3565360863.

The spelling of 85391244 in words is "eighty-five million, three hundred ninety-one thousand, two hundred forty-four".