81844338 has 8 divisors (see below), whose sum is σ = 163688688. Its totient is φ = 27281444.

The previous prime is 81844337. The next prime is 81844369. The reversal of 81844338 is 83344818.

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

81844338 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81844296 and 81844305.

It is not an unprimeable number, because it can be changed into a prime (81844337) 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, 6820356 + ... + 6820367.

It is an arithmetic number, because the mean of its divisors is an integer number (20461086).

Almost surely, 2^81844338 is an apocalyptic number.

81844338 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81844338 is a wasteful number, since it uses less digits than its factorization.

81844338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13640728.

The product of its digits is 73728, while the sum is 39.

The square root of 81844338 is about 9046.7860591483. The cubic root of 81844338 is about 434.1730676605.

The spelling of 81844338 in words is "eighty-one million, eight hundred forty-four thousand, three hundred thirty-eight".