85987815 has 16 divisors (see below), whose sum is σ = 141299808. Its totient is φ = 44620416.

The previous prime is 85987807. The next prime is 85987817. The reversal of 85987815 is 51878958.

It is not a de Polignac number, because 85987815 - 2³ = 85987807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85987817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76912 + ... + 78021.

It is an arithmetic number, because the mean of its divisors is an integer number (8831238).

Almost surely, 2^85987815 is an apocalyptic number.

85987815 is a deficient number, since it is larger than the sum of its proper divisors (55311993).

85987815 is a wasteful number, since it uses less digits than its factorization.

85987815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154978.

The product of its digits is 806400, while the sum is 51.

The square root of 85987815 is about 9272.9615010524. The cubic root of 85987815 is about 441.3796484958.

The spelling of 85987815 in words is "eighty-five million, nine hundred eighty-seven thousand, eight hundred fifteen".