85991424 has 56 divisors (see below), whose sum is σ = 229362000. Its totient is φ = 28655616.

The previous prime is 85991417. The next prime is 85991449. The reversal of 85991424 is 42419958.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22827 + ... + 26325.

It is an arithmetic number, because the mean of its divisors is an integer number (4095750).

Almost surely, 2^85991424 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 85991424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114681000).

85991424 is an abundant number, since it is smaller than the sum of its proper divisors (143370576).

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

85991424 is an equidigital number, since it uses as much as digits as its factorization.

85991424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3528 (or 3504 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 85991424 is about 9273.1560970362. The cubic root of 85991424 is about 441.3858234671.

The spelling of 85991424 in words is "eighty-five million, nine hundred ninety-one thousand, four hundred twenty-four".