81144752 has 20 divisors (see below), whose sum is σ = 169312080. Its totient is φ = 37451328.

The previous prime is 81144731. The next prime is 81144761. The reversal of 81144752 is 25744118.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194852 + ... + 195267.

It is an arithmetic number, because the mean of its divisors is an integer number (8465604).

Almost surely, 2^81144752 is an apocalyptic number.

It is an amenable number.

81144752 is an abundant number, since it is smaller than the sum of its proper divisors (88167328).

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

81144752 is a wasteful number, since it uses less digits than its factorization.

81144752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390140 (or 390134 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 81144752 is about 9008.0381881961. The cubic root of 81144752 is about 432.9324566137.

The spelling of 81144752 in words is "eighty-one million, one hundred forty-four thousand, seven hundred fifty-two".