81823357 has 16 divisors (see below), whose sum is σ = 102960000. Its totient is φ = 63167040.

The previous prime is 81823349. The next prime is 81823369. The reversal of 81823357 is 75332818.

It is a cyclic number.

It is not a de Polignac number, because 81823357 - 2³ = 81823349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81823327) 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 15 ways as a sum of consecutive naturals, for example, 3519 + ... + 13267.

It is an arithmetic number, because the mean of its divisors is an integer number (6435000).

Almost surely, 2^81823357 is an apocalyptic number.

It is an amenable number.

81823357 is a deficient number, since it is larger than the sum of its proper divisors (21136643).

81823357 is a wasteful number, since it uses less digits than its factorization.

81823357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9876.

The product of its digits is 40320, while the sum is 37.

The square root of 81823357 is about 9045.6264017480. The cubic root of 81823357 is about 434.1359640405.

The spelling of 81823357 in words is "eighty-one million, eight hundred twenty-three thousand, three hundred fifty-seven".