81464244 has 12 divisors (see below), whose sum is σ = 190083264. Its totient is φ = 27154744.

The previous prime is 81464239. The next prime is 81464261. The reversal of 81464244 is 44246418.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3394332 + ... + 3394355.

It is an arithmetic number, because the mean of its divisors is an integer number (15840272).

Almost surely, 2^81464244 is an apocalyptic number.

It is an amenable number.

81464244 is an abundant number, since it is smaller than the sum of its proper divisors (108619020).

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

81464244 is a wasteful number, since it uses less digits than its factorization.

81464244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788694 (or 6788692 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 81464244 is about 9025.7544836983. The cubic root of 81464244 is about 433.4999088719.

The spelling of 81464244 in words is "eighty-one million, four hundred sixty-four thousand, two hundred forty-four".