85391712 has 144 divisors (see below), whose sum is σ = 289865520. Its totient is φ = 24385536.

The previous prime is 85391687. The next prime is 85391717. The reversal of 85391712 is 21719358.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85391717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41328 + ... + 43344.

It is an arithmetic number, because the mean of its divisors is an integer number (2012955).

Almost surely, 2^85391712 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 85391712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144932760).

85391712 is an abundant number, since it is smaller than the sum of its proper divisors (204473808).

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

85391712 is a wasteful number, since it uses less digits than its factorization.

85391712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050 (or 2029 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 85391712 is about 9240.7636048110. The cubic root of 85391712 is about 440.3573405657.

The spelling of 85391712 in words is "eighty-five million, three hundred ninety-one thousand, seven hundred twelve".