81067392 has 160 divisors (see below), whose sum is σ = 275967120. Its totient is φ = 23141376.

The previous prime is 81067391. The next prime is 81067403. The reversal of 81067392 is 29376018.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81067391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72018 + ... + 73134.

Almost surely, 2^81067392 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 81067392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137983560).

81067392 is an abundant number, since it is smaller than the sum of its proper divisors (194899728).

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

81067392 is a wasteful number, since it uses less digits than its factorization.

81067392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81067392 is about 9003.7432215718. The cubic root of 81067392 is about 432.7948329932.

The spelling of 81067392 in words is "eighty-one million, sixty-seven thousand, three hundred ninety-two".