81263344 has 10 divisors (see below), whose sum is σ = 157447760. Its totient is φ = 40631664.

The previous prime is 81263327. The next prime is 81263411. The reversal of 81263344 is 44336218.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2539464 + ... + 2539495.

It is an arithmetic number, because the mean of its divisors is an integer number (15744776).

Almost surely, 2^81263344 is an apocalyptic number.

It is an amenable number.

81263344 is a deficient number, since it is larger than the sum of its proper divisors (76184416).

81263344 is a wasteful number, since it uses less digits than its factorization.

81263344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5078967 (or 5078961 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 81263344 is about 9014.6183502132. The cubic root of 81263344 is about 433.1432623358.

The spelling of 81263344 in words is "eighty-one million, two hundred sixty-three thousand, three hundred forty-four".