81892412 has 12 divisors (see below), whose sum is σ = 163784880. Its totient is φ = 35096736.

The previous prime is 81892411. The next prime is 81892441. The reversal of 81892412 is 21429818.

81892412 is an admirable number.

It is a super-3 number, since 3×81892412³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81892411) 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, 1462337 + ... + 1462392.

It is an arithmetic number, because the mean of its divisors is an integer number (13648740).

Almost surely, 2^81892412 is an apocalyptic number.

It is an amenable number.

81892412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81892412 is a wasteful number, since it uses less digits than its factorization.

81892412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2924740 (or 2924738 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 81892412 is about 9049.4426347704. The cubic root of 81892412 is about 434.2580596961.

It can be divided in two parts, 8189 and 2412, that added together give a palindrome (10601).

The spelling of 81892412 in words is "eighty-one million, eight hundred ninety-two thousand, four hundred twelve".