81456244 has 24 divisors (see below), whose sum is σ = 147840840. Its totient is φ = 39223296.

The previous prime is 81456239. The next prime is 81456253. The reversal of 81456244 is 44265418.

It can be written as a sum of positive squares in 4 ways, for example, as 31584400 + 49871844 = 5620^2 + 7062^2 .

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, 66324 + ... + 67540.

It is an arithmetic number, because the mean of its divisors is an integer number (6160035).

Almost surely, 2^81456244 is an apocalyptic number.

It is an amenable number.

81456244 is a deficient number, since it is larger than the sum of its proper divisors (66384596).

81456244 is a wasteful number, since it uses less digits than its factorization.

81456244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827 (or 1825 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 81456244 is about 9025.3112965703. The cubic root of 81456244 is about 433.4857181356.

The spelling of 81456244 in words is "eighty-one million, four hundred fifty-six thousand, two hundred forty-four".