81842230 has 8 divisors (see below), whose sum is σ = 147316032. Its totient is φ = 32736888.

The previous prime is 81842221. The next prime is 81842231. The reversal of 81842230 is 3224818.

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

It is a super-2 number, since 2×81842230² = 13396301222745800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81842231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4092102 + ... + 4092121.

It is an arithmetic number, because the mean of its divisors is an integer number (18414504).

Almost surely, 2^81842230 is an apocalyptic number.

81842230 is a deficient number, since it is larger than the sum of its proper divisors (65473802).

81842230 is a wasteful number, since it uses less digits than its factorization.

81842230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184230.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 81842230 is about 9046.6695529349. The cubic root of 81842230 is about 434.1693400775.

The spelling of 81842230 in words is "eighty-one million, eight hundred forty-two thousand, two hundred thirty".