85665524 has 72 divisors (see below), whose sum is σ = 188149248. Its totient is φ = 33929280.

The previous prime is 85665521. The next prime is 85665527. The reversal of 85665524 is 42556658.

It is an interprime number because it is at equal distance from previous prime (85665521) and next prime (85665527).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85665521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139442 + ... + 140054.

It is an arithmetic number, because the mean of its divisors is an integer number (2613184).

Almost surely, 2^85665524 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 85665524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94074624).

85665524 is an abundant number, since it is smaller than the sum of its proper divisors (102483724).

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

85665524 is a wasteful number, since it uses less digits than its factorization.

85665524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 676 counting only the distinct ones).

The product of its digits is 288000, while the sum is 41.

The square root of 85665524 is about 9255.5671895352. The cubic root of 85665524 is about 440.8275129593.

The spelling of 85665524 in words is "eighty-five million, six hundred sixty-five thousand, five hundred twenty-four".