81894912 has 160 divisors (see below), whose sum is σ = 246305664. Its totient is φ = 23961600.

The previous prime is 81894893. The next prime is 81894937. The reversal of 81894912 is 21949818.

It is a super-2 number, since 2×81894912² = 13413553222975488, which contains 22 as substring.

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, 625087 + ... + 625217.

Almost surely, 2^81894912 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 81894912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123152832).

81894912 is an abundant number, since it is smaller than the sum of its proper divisors (164410752).

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

81894912 is a wasteful number, since it uses less digits than its factorization.

81894912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 184 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 81894912 is about 9049.5807637702. The cubic root of 81894912 is about 434.2624786408.

The spelling of 81894912 in words is "eighty-one million, eight hundred ninety-four thousand, nine hundred twelve".