81823354 has 16 divisors (see below), whose sum is σ = 126425088. Its totient is φ = 39688272.

The previous prime is 81823349. The next prime is 81823369. The reversal of 81823354 is 45332818.

It is a happy number.

It is a super-2 number, since 2×81823354² = 13390122519618632, which contains 22 as substring.

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, 26899 + ... + 29785.

It is an arithmetic number, because the mean of its divisors is an integer number (7901568).

Almost surely, 2^81823354 is an apocalyptic number.

81823354 is a deficient number, since it is larger than the sum of its proper divisors (44601734).

81823354 is a wasteful number, since it uses less digits than its factorization.

81823354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309.

The product of its digits is 23040, while the sum is 34.

The square root of 81823354 is about 9045.6262359220. The cubic root of 81823354 is about 434.1359587347.

The spelling of 81823354 in words is "eighty-one million, eight hundred twenty-three thousand, three hundred fifty-four".