81354112 has 128 divisors (see below), whose sum is σ = 201960000. Its totient is φ = 32514048.

The previous prime is 81354101. The next prime is 81354113. The reversal of 81354112 is 21145318.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81354113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 746314 + ... + 746422.

Almost surely, 2^81354112 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 81354112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100980000).

81354112 is an abundant number, since it is smaller than the sum of its proper divisors (120605888).

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

81354112 is a wasteful number, since it uses less digits than its factorization.

81354112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 135 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 81354112 is about 9019.6514345068. The cubic root of 81354112 is about 433.3044703984.

The spelling of 81354112 in words is "eighty-one million, three hundred fifty-four thousand, one hundred twelve".