81392192 has 56 divisors (see below), whose sum is σ = 195462144. Its totient is φ = 32827392.

The previous prime is 81392161. The next prime is 81392221. The reversal of 81392192 is 29129318.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

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, 2273 + ... + 12959.

Almost surely, 2^81392192 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 81392192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97731072).

81392192 is an abundant number, since it is smaller than the sum of its proper divisors (114069952).

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

81392192 is a wasteful number, since it uses less digits than its factorization.

81392192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10723 (or 10713 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 81392192 is about 9021.7621338628. The cubic root of 81392192 is about 433.3720664917.

The spelling of 81392192 in words is "eighty-one million, three hundred ninety-two thousand, one hundred ninety-two".