81444822 has 16 divisors (see below), whose sum is σ = 163001712. Its totient is φ = 27129600.

The previous prime is 81444809. The next prime is 81444823. The reversal of 81444822 is 22844418.

It is a super-2 number, since 2×81444822² = 13266518061223368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81444823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7038 + ... + 14574.

It is an arithmetic number, because the mean of its divisors is an integer number (10187607).

Almost surely, 2^81444822 is an apocalyptic number.

81444822 is an abundant number, since it is smaller than the sum of its proper divisors (81556890).

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

81444822 is a wasteful number, since it uses less digits than its factorization.

81444822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9343.

The product of its digits is 16384, while the sum is 33.

The square root of 81444822 is about 9024.6784984286. The cubic root of 81444822 is about 433.4654557016.

The spelling of 81444822 in words is "eighty-one million, four hundred forty-four thousand, eight hundred twenty-two".