81824833 has 4 divisors (see below), whose sum is σ = 81872068. Its totient is φ = 81777600.

The previous prime is 81824819. The next prime is 81824837. The reversal of 81824833 is 33842818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52751169 + 29073664 = 7263^2 + 5392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81824833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81824792 and 81824801.

It is not an unprimeable number, because it can be changed into a prime (81824837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20916 + ... + 24517.

It is an arithmetic number, because the mean of its divisors is an integer number (20468017).

Almost surely, 2^81824833 is an apocalyptic number.

It is an amenable number.

81824833 is a deficient number, since it is larger than the sum of its proper divisors (47235).

81824833 is a wasteful number, since it uses less digits than its factorization.

81824833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47234.

The product of its digits is 36864, while the sum is 37.

The square root of 81824833 is about 9045.7079877697. The cubic root of 81824833 is about 434.1385744639.

It can be divided in two parts, 818 and 24833, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 81824833 in words is "eighty-one million, eight hundred twenty-four thousand, eight hundred thirty-three".