81817614 has 48 divisors (see below), whose sum is σ = 186251520. Its totient is φ = 26914680.

The previous prime is 81817607. The next prime is 81817627. The reversal of 81817614 is 41671818.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37329 + ... + 39459.

It is an arithmetic number, because the mean of its divisors is an integer number (3880240).

Almost surely, 2^81817614 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81817614, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93125760).

81817614 is an abundant number, since it is smaller than the sum of its proper divisors (104433906).

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

81817614 is a wasteful number, since it uses less digits than its factorization.

81817614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227 (or 2215 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 81817614 is about 9045.3089499475. The cubic root of 81817614 is about 434.1258067893.

The spelling of 81817614 in words is "eighty-one million, eight hundred seventeen thousand, six hundred fourteen".