81288886 has 8 divisors (see below), whose sum is σ = 139352400. Its totient is φ = 34838088.

The previous prime is 81288881. The next prime is 81288899. The reversal of 81288886 is 68888218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81288881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2903161 + ... + 2903188.

It is an arithmetic number, because the mean of its divisors is an integer number (17419050).

Almost surely, 2^81288886 is an apocalyptic number.

81288886 is a deficient number, since it is larger than the sum of its proper divisors (58063514).

81288886 is a wasteful number, since it uses less digits than its factorization.

81288886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806358.

The product of its digits is 393216, while the sum is 49.

The square root of 81288886 is about 9016.0349378205. The cubic root of 81288886 is about 433.1886382120.

It can be divided in two parts, 812 and 88886, that added together give a palindrome (89698).

The spelling of 81288886 in words is "eighty-one million, two hundred eighty-eight thousand, eight hundred eighty-six".