81823236 has 48 divisors (see below), whose sum is σ = 217340928. Its totient is φ = 23716000.

The previous prime is 81823211. The next prime is 81823237. The reversal of 81823236 is 63232818.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 81823197 and 81823206.

It is not an unprimeable number, because it can be changed into a prime (81823237) 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, 10440 + ... + 16511.

It is an arithmetic number, because the mean of its divisors is an integer number (4527936).

Almost surely, 2^81823236 is an apocalyptic number.

It is an amenable number.

81823236 is an abundant number, since it is smaller than the sum of its proper divisors (135517692).

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

81823236 is a wasteful number, since it uses less digits than its factorization.

81823236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26992 (or 26990 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 81823236 is about 9045.6197134304. The cubic root of 81823236 is about 434.1357500410.

The spelling of 81823236 in words is "eighty-one million, eight hundred twenty-three thousand, two hundred thirty-six".