81386112 has 32 divisors (see below), whose sum is σ = 216182880. Its totient is φ = 27128576.

The previous prime is 81386099. The next prime is 81386113. The reversal of 81386112 is 21168318.

It is a tau number, because it is divible by the number of its divisors (32).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 81386112.

It is not an unprimeable number, because it can be changed into a prime (81386113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105588 + ... + 106355.

It is an arithmetic number, because the mean of its divisors is an integer number (6755715).

Almost surely, 2^81386112 is an apocalyptic number.

It is an amenable number.

81386112 is an abundant number, since it is smaller than the sum of its proper divisors (134796768).

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

81386112 is a wasteful number, since it uses less digits than its factorization.

81386112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211960 (or 211948 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 81386112 is about 9021.4251645735. The cubic root of 81386112 is about 433.3612752528.

The spelling of 81386112 in words is "eighty-one million, three hundred eighty-six thousand, one hundred twelve".