81835366 has 8 divisors (see below), whose sum is σ = 125364960. Its totient is φ = 40047048.

The previous prime is 81835363. The next prime is 81835373. The reversal of 81835366 is 66353818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81835363) 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 3 ways as a sum of consecutive naturals, for example, 435201 + ... + 435388.

It is an arithmetic number, because the mean of its divisors is an integer number (15670620).

Almost surely, 2^81835366 is an apocalyptic number.

81835366 is a deficient number, since it is larger than the sum of its proper divisors (43529594).

81835366 is a wasteful number, since it uses less digits than its factorization.

81835366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870638.

The product of its digits is 103680, while the sum is 40.

The square root of 81835366 is about 9046.2901788523. The cubic root of 81835366 is about 434.1572020013.

The spelling of 81835366 in words is "eighty-one million, eight hundred thirty-five thousand, three hundred sixty-six".