81586675 has 12 divisors (see below), whose sum is σ = 102884040. Its totient is φ = 64161920.

The previous prime is 81586667. The next prime is 81586693. The reversal of 81586675 is 57668518.

It is not a de Polignac number, because 81586675 - 2³ = 81586667 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26182 + ... + 29131.

It is an arithmetic number, because the mean of its divisors is an integer number (8573670).

Almost surely, 2^81586675 is an apocalyptic number.

81586675 is a deficient number, since it is larger than the sum of its proper divisors (21297365).

81586675 is a wasteful number, since it uses less digits than its factorization.

81586675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55382 (or 55377 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The square root of 81586675 is about 9032.5342512498. The cubic root of 81586675 is about 433.7169663155.

It can be divided in two parts, 81 and 586675, that added together give a square (586756 = 766²).

The spelling of 81586675 in words is "eighty-one million, five hundred eighty-six thousand, six hundred seventy-five".