81842582 has 16 divisors (see below), whose sum is σ = 127258560. Its totient is φ = 39428928.

The previous prime is 81842569. The next prime is 81842587. The reversal of 81842582 is 28524818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81842587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34643 + ... + 36929.

It is an arithmetic number, because the mean of its divisors is an integer number (7953660).

Almost surely, 2^81842582 is an apocalyptic number.

81842582 is a deficient number, since it is larger than the sum of its proper divisors (45415978).

81842582 is a wasteful number, since it uses less digits than its factorization.

81842582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935.

The product of its digits is 40960, while the sum is 38.

The square root of 81842582 is about 9046.6890075873. The cubic root of 81842582 is about 434.1699625246.

The spelling of 81842582 in words is "eighty-one million, eight hundred forty-two thousand, five hundred eighty-two".