81288286 has 16 divisors (see below), whose sum is σ = 126395136. Its totient is φ = 39182616.

The previous prime is 81288269. The next prime is 81288301. The reversal of 81288286 is 68288218.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156 + ... + 12751.

It is an arithmetic number, because the mean of its divisors is an integer number (7899696).

Almost surely, 2^81288286 is an apocalyptic number.

81288286 is a deficient number, since it is larger than the sum of its proper divisors (45106850).

81288286 is a wasteful number, since it uses less digits than its factorization.

81288286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13023.

The product of its digits is 98304, while the sum is 43.

The square root of 81288286 is about 9016.0016637088. The cubic root of 81288286 is about 433.1875724090.

It can be divided in two parts, 812 and 88286, that added together give a palindrome (89098).

The spelling of 81288286 in words is "eighty-one million, two hundred eighty-eight thousand, two hundred eighty-six".