81853368 has 64 divisors (see below), whose sum is σ = 228096000. Its totient is φ = 24325632.

The previous prime is 81853357. The next prime is 81853391. The reversal of 81853368 is 86335818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2473 + ... + 13031.

It is an arithmetic number, because the mean of its divisors is an integer number (3564000).

Almost surely, 2^81853368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81853368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114048000).

81853368 is an abundant number, since it is smaller than the sum of its proper divisors (146242632).

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

81853368 is a wasteful number, since it uses less digits than its factorization.

81853368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10604 (or 10600 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 81853368 is about 9047.2851176472. The cubic root of 81853368 is about 434.1890347134.

The spelling of 81853368 in words is "eighty-one million, eight hundred fifty-three thousand, three hundred sixty-eight".