81823330 has 8 divisors (see below), whose sum is σ = 147282012. Its totient is φ = 32729328.

The previous prime is 81823327. The next prime is 81823333. The reversal of 81823330 is 3332818.

It is an interprime number because it is at equal distance from previous prime (81823327) and next prime (81823333).

It can be written as a sum of positive squares in 2 ways, for example, as 81378441 + 444889 = 9021^2 + 667^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81823333) 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, 4091157 + ... + 4091176.

Almost surely, 2^81823330 is an apocalyptic number.

81823330 is a deficient number, since it is larger than the sum of its proper divisors (65458682).

81823330 is a wasteful number, since it uses less digits than its factorization.

81823330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182340.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 81823330 is about 9045.6249093139. The cubic root of 81823330 is about 434.1359162885.

The spelling of 81823330 in words is "eighty-one million, eight hundred twenty-three thousand, three hundred thirty".