81386016 has 48 divisors (see below), whose sum is σ = 217274400. Its totient is φ = 26667008.

The previous prime is 81386003. The next prime is 81386023. The reversal of 81386016 is 61068318.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1521 + ... + 12848.

It is an arithmetic number, because the mean of its divisors is an integer number (4526550).

Almost surely, 2^81386016 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 81386016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108637200).

81386016 is an abundant number, since it is smaller than the sum of its proper divisors (135888384).

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

81386016 is a wasteful number, since it uses less digits than its factorization.

81386016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14441 (or 14433 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81386016 is about 9021.4198439048. The cubic root of 81386016 is about 433.3611048605.

The spelling of 81386016 in words is "eighty-one million, three hundred eighty-six thousand, sixteen".