81287526 has 16 divisors (see below), whose sum is σ = 163047744. Its totient is φ = 27017064.

The previous prime is 81287467. The next prime is 81287593. The reversal of 81287526 is 62578218.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 17440 + ... + 21603.

It is an arithmetic number, because the mean of its divisors is an integer number (10190484).

Almost surely, 2^81287526 is an apocalyptic number.

81287526 is an abundant number, since it is smaller than the sum of its proper divisors (81760218).

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

81287526 is a wasteful number, since it uses less digits than its factorization.

81287526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39395.

The product of its digits is 53760, while the sum is 39.

The square root of 81287526 is about 9015.9595163244. The cubic root of 81287526 is about 433.1862223843.

The spelling of 81287526 in words is "eighty-one million, two hundred eighty-seven thousand, five hundred twenty-six".