81752444 has 12 divisors (see below), whose sum is σ = 145412568. Its totient is φ = 40206000.

The previous prime is 81752443. The next prime is 81752467. The reversal of 81752444 is 44425718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81752443) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 167282 + ... + 167769.

It is an arithmetic number, because the mean of its divisors is an integer number (12117714).

Almost surely, 2^81752444 is an apocalyptic number.

It is an amenable number.

81752444 is a deficient number, since it is larger than the sum of its proper divisors (63660124).

81752444 is a wasteful number, since it uses less digits than its factorization.

81752444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335116 (or 335114 counting only the distinct ones).

The product of its digits is 35840, while the sum is 35.

The square root of 81752444 is about 9041.7058125113. The cubic root of 81752444 is about 434.0105117546.

The spelling of 81752444 in words is "eighty-one million, seven hundred fifty-two thousand, four hundred forty-four".