81458168 has 96 divisors (see below), whose sum is σ = 182582400. Its totient is φ = 33929280.

The previous prime is 81458123. The next prime is 81458171. The reversal of 81458168 is 86185418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 790805 + ... + 790907.

It is an arithmetic number, because the mean of its divisors is an integer number (1901900).

Almost surely, 2^81458168 is an apocalyptic number.

81458168 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81458168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91291200).

81458168 is an abundant number, since it is smaller than the sum of its proper divisors (101124232).

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

81458168 is a wasteful number, since it uses less digits than its factorization.

81458168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 178 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 81458168 is about 9025.4178850622. The cubic root of 81458168 is about 433.4891310925.

The spelling of 81458168 in words is "eighty-one million, four hundred fifty-eight thousand, one hundred sixty-eight".