81752442 has 32 divisors (see below), whose sum is σ = 174787200. Its totient is φ = 25428480.

The previous prime is 81752431. The next prime is 81752443. The reversal of 81752442 is 24425718.

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 15 ways as a sum of consecutive naturals, for example, 1567 + ... + 12882.

It is an arithmetic number, because the mean of its divisors is an integer number (5462100).

Almost surely, 2^81752442 is an apocalyptic number.

81752442 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81752442 is an abundant number, since it is smaller than the sum of its proper divisors (93034758).

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

81752442 is a wasteful number, since it uses less digits than its factorization.

81752442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14518.

The product of its digits is 17920, while the sum is 33.

The square root of 81752442 is about 9041.7057019127. The cubic root of 81752442 is about 434.0105082153.

The spelling of 81752442 in words is "eighty-one million, seven hundred fifty-two thousand, four hundred forty-two".