81234792 has 64 divisors (see below), whose sum is σ = 228873600. Its totient is φ = 26691840.

The previous prime is 81234779. The next prime is 81234793. The reversal of 81234792 is 29743218.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (81234793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12688 + ... + 17984.

It is an arithmetic number, because the mean of its divisors is an integer number (3576150).

Almost surely, 2^81234792 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 81234792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114436800).

81234792 is an abundant number, since it is smaller than the sum of its proper divisors (147638808).

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

81234792 is a wasteful number, since it uses less digits than its factorization.

81234792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5383 (or 5373 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81234792 is about 9013.0345611231. The cubic root of 81234792 is about 433.0925278780.

81234792 divided by its sum of digits (36) gives a palindrome (2256522).

The spelling of 81234792 in words is "eighty-one million, two hundred thirty-four thousand, seven hundred ninety-two".