85985985 has 16 divisors (see below), whose sum is σ = 138663936. Its totient is φ = 45497088.

The previous prime is 85985953. The next prime is 85985987. The reversal of 85985985 is 58958958.

It is not a de Polignac number, because 85985985 - 2⁵ = 85985953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85985987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20664 + ... + 24473.

It is an arithmetic number, because the mean of its divisors is an integer number (8666496).

Almost surely, 2^85985985 is an apocalyptic number.

It is an amenable number.

85985985 is a deficient number, since it is larger than the sum of its proper divisors (52677951).

85985985 is a wasteful number, since it uses less digits than its factorization.

85985985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45272.

The product of its digits is 5184000, while the sum is 57.

The square root of 85985985 is about 9272.8628265493. The cubic root of 85985985 is about 441.3765173139.

The spelling of 85985985 in words is "eighty-five million, nine hundred eighty-five thousand, nine hundred eighty-five".