81910336 has 28 divisors (see below), whose sum is σ = 163220400. Its totient is φ = 40784000.

The previous prime is 81910321. The next prime is 81910379. The reversal of 81910336 is 63301918.

It is a junction number, because it is equal to n+sod(n) for n = 81910298 and 81910307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13515 + ... + 18613.

It is an arithmetic number, because the mean of its divisors is an integer number (5829300).

Almost surely, 2^81910336 is an apocalyptic number.

It is an amenable number.

81910336 is a deficient number, since it is larger than the sum of its proper divisors (81310064).

81910336 is a wasteful number, since it uses less digits than its factorization.

81910336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362 (or 5352 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 81910336 is about 9050.4329178222. The cubic root of 81910336 is about 434.2897397727.

The spelling of 81910336 in words is "eighty-one million, nine hundred ten thousand, three hundred thirty-six".