81893033 has 8 divisors (see below), whose sum is σ = 83232000. Its totient is φ = 80559360.

The previous prime is 81893023. The next prime is 81893047. The reversal of 81893033 is 33039818.

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

It is a cyclic number.

It is not a de Polignac number, because 81893033 - 2⁸ = 81892777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81892984 and 81893002.

It is not an unprimeable number, because it can be changed into a prime (81893023) 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 7 ways as a sum of consecutive naturals, for example, 39968 + ... + 41966.

It is an arithmetic number, because the mean of its divisors is an integer number (10404000).

Almost surely, 2^81893033 is an apocalyptic number.

It is an amenable number.

81893033 is a deficient number, since it is larger than the sum of its proper divisors (1338967).

81893033 is a wasteful number, since it uses less digits than its factorization.

81893033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 81893033 is about 9049.4769462108. The cubic root of 81893033 is about 434.2591573704.

The spelling of 81893033 in words is "eighty-one million, eight hundred ninety-three thousand, thirty-three".