81182912 has 56 divisors (see below), whose sum is σ = 166567104. Its totient is φ = 39237632.

The previous prime is 81182903. The next prime is 81182923. The reversal of 81182912 is 21928118.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 411998 + ... + 412194.

Almost surely, 2^81182912 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 81182912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83283552).

81182912 is an abundant number, since it is smaller than the sum of its proper divisors (85384192).

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

81182912 is a wasteful number, since it uses less digits than its factorization.

81182912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 383 counting only the distinct ones).

The product of its digits is 2304, while the sum is 32.

The square root of 81182912 is about 9010.1560474833. The cubic root of 81182912 is about 433.0003111291. Note that the first 3 decimals are identical.

The spelling of 81182912 in words is "eighty-one million, one hundred eighty-two thousand, nine hundred twelve".