81782933 has 8 divisors (see below), whose sum is σ = 83018880. Its totient is φ = 80552160.

The previous prime is 81782923. The next prime is 81782951. The reversal of 81782933 is 33928718.

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 81782933 - 2⁸ = 81782677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81782923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40166 + ... + 42152.

It is an arithmetic number, because the mean of its divisors is an integer number (10377360).

Almost surely, 2^81782933 is an apocalyptic number.

It is an amenable number.

81782933 is a deficient number, since it is larger than the sum of its proper divisors (1235947).

81782933 is a wasteful number, since it uses less digits than its factorization.

81782933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587.

The product of its digits is 72576, while the sum is 41.

The square root of 81782933 is about 9043.3916756934. The cubic root of 81782933 is about 434.0644587731.

It can be divided in two parts, 8178 and 2933, that added together give a palindrome (11111).

The spelling of 81782933 in words is "eighty-one million, seven hundred eighty-two thousand, nine hundred thirty-three".