81288846 has 24 divisors (see below), whose sum is σ = 182650104. Its totient is φ = 27096120.

The previous prime is 81288839. The next prime is 81288847. The reversal of 81288846 is 64888218.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81288847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83145 + ... + 84116.

It is an arithmetic number, because the mean of its divisors is an integer number (7610421).

Almost surely, 2^81288846 is an apocalyptic number.

81288846 is an abundant number, since it is smaller than the sum of its proper divisors (101361258).

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

81288846 is a wasteful number, since it uses less digits than its factorization.

81288846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167278 (or 167266 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 81288846 is about 9016.0327195502. The cubic root of 81288846 is about 433.1885671586.

The spelling of 81288846 in words is "eighty-one million, two hundred eighty-eight thousand, eight hundred forty-six".