81033823 has 8 divisors (see below), whose sum is σ = 87825248. Its totient is φ = 74322144.

The previous prime is 81033817. The next prime is 81033833. The reversal of 81033823 is 32833018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-81033823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81033791 and 81033800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81033833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17811 + ... + 21892.

It is an arithmetic number, because the mean of its divisors is an integer number (10978156).

Almost surely, 2^81033823 is an apocalyptic number.

81033823 is a deficient number, since it is larger than the sum of its proper divisors (6791425).

81033823 is a wasteful number, since it uses less digits than its factorization.

81033823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39873.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 81033823 is about 9001.8788594382. The cubic root of 81033823 is about 432.7350864243.

The spelling of 81033823 in words is "eighty-one million, thirty-three thousand, eight hundred twenty-three".