81524214 has 48 divisors (see below), whose sum is σ = 187922592. Its totient is φ = 25453824.

The previous prime is 81524207. The next prime is 81524227. The reversal of 81524214 is 41242518.

It is a super-3 number, since 3×81524214³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79972 + ... + 80984.

It is an arithmetic number, because the mean of its divisors is an integer number (3915054).

Almost surely, 2^81524214 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81524214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93961296).

81524214 is an abundant number, since it is smaller than the sum of its proper divisors (106398378).

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

81524214 is a wasteful number, since it uses less digits than its factorization.

81524214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301 (or 1298 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 81524214 is about 9029.0760324631. The cubic root of 81524214 is about 433.6062566044.

The spelling of 81524214 in words is "eighty-one million, five hundred twenty-four thousand, two hundred fourteen".