81285336 has 64 divisors (see below), whose sum is σ = 246326400. Its totient is φ = 24631200.

The previous prime is 81285319. The next prime is 81285343. The reversal of 81285336 is 63358218.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81285336.

It is a congruent number.

It is an unprimeable number.

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, 14730 + ... + 19481.

It is an arithmetic number, because the mean of its divisors is an integer number (3848850).

Almost surely, 2^81285336 is an apocalyptic number.

It is an amenable number.

81285336 is an abundant number, since it is smaller than the sum of its proper divisors (165041064).

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

81285336 is a wasteful number, since it uses less digits than its factorization.

81285336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34237 (or 34227 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81285336 is about 9015.8380642068. The cubic root of 81285336 is about 433.1823321345.

The spelling of 81285336 in words is "eighty-one million, two hundred eighty-five thousand, three hundred thirty-six".