81832442 has 8 divisors (see below), whose sum is σ = 122966100. Its totient is φ = 40843744.

The previous prime is 81832427. The next prime is 81832447. The reversal of 81832442 is 24423818.

It can be written as a sum of positive squares in 2 ways, for example, as 79727041 + 2105401 = 8929^2 + 1451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81832399 and 81832408.

It is not an unprimeable number, because it can be changed into a prime (81832447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34817 + ... + 37092.

Almost surely, 2^81832442 is an apocalyptic number.

81832442 is a deficient number, since it is larger than the sum of its proper divisors (41133658).

81832442 is a wasteful number, since it uses less digits than its factorization.

81832442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72480.

The product of its digits is 12288, while the sum is 32.

The square root of 81832442 is about 9046.1285641981. The cubic root of 81832442 is about 434.1520310879.

The spelling of 81832442 in words is "eighty-one million, eight hundred thirty-two thousand, four hundred forty-two".