85639925 has 24 divisors (see below), whose sum is σ = 126646656. Its totient is φ = 56168640.

The previous prime is 85639921. The next prime is 85639937. The reversal of 85639925 is 52993658.

It is not a de Polignac number, because 85639925 - 2² = 85639921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85639925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85639921) 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, 6614 + ... + 14663.

It is an arithmetic number, because the mean of its divisors is an integer number (5276944).

Almost surely, 2^85639925 is an apocalyptic number.

It is an amenable number.

85639925 is a deficient number, since it is larger than the sum of its proper divisors (41006731).

85639925 is a wasteful number, since it uses less digits than its factorization.

85639925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21317 (or 21312 counting only the distinct ones).

The product of its digits is 583200, while the sum is 47.

The square root of 85639925 is about 9254.1841887873. The cubic root of 85639925 is about 440.7835984913.

The spelling of 85639925 in words is "eighty-five million, six hundred thirty-nine thousand, nine hundred twenty-five".