81842588 has 24 divisors (see below), whose sum is σ = 147958272. Its totient is φ = 39587184.

The previous prime is 81842587. The next prime is 81842591. The reversal of 81842588 is 88524818.

It is a happy number.

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, 16181 + ... + 20627.

It is an arithmetic number, because the mean of its divisors is an integer number (6164928).

Almost surely, 2^81842588 is an apocalyptic number.

It is an amenable number.

81842588 is a deficient number, since it is larger than the sum of its proper divisors (66115684).

81842588 is a wasteful number, since it uses less digits than its factorization.

81842588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601 (or 4599 counting only the distinct ones).

The product of its digits is 163840, while the sum is 44.

The square root of 81842588 is about 9046.6893392003. The cubic root of 81842588 is about 434.1699731345.

The spelling of 81842588 in words is "eighty-one million, eight hundred forty-two thousand, five hundred eighty-eight".