85515864 has 32 divisors (see below), whose sum is σ = 244331520. Its totient is φ = 24433056.

The previous prime is 85515851. The next prime is 85515869. The reversal of 85515864 is 46851558.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85515869) 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 7 ways as a sum of consecutive naturals, for example, 254344 + ... + 254679.

It is an arithmetic number, because the mean of its divisors is an integer number (7635360).

Almost surely, 2^85515864 is an apocalyptic number.

85515864 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

85515864 is an abundant number, since it is smaller than the sum of its proper divisors (158815656).

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

85515864 is a wasteful number, since it uses less digits than its factorization.

85515864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509039 (or 509035 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The square root of 85515864 is about 9247.4787915410. The cubic root of 85515864 is about 440.5706507685.

The spelling of 85515864 in words is "eighty-five million, five hundred fifteen thousand, eight hundred sixty-four".