81992336 has 10 divisors (see below), whose sum is σ = 158860182. Its totient is φ = 40996160.

The previous prime is 81992329. The next prime is 81992399. The reversal of 81992336 is 63329918.

It can be written as a sum of positive squares in only one way, i.e., 56550400 + 25441936 = 7520^2 + 5044^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81992293 and 81992302.

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 as a sum of consecutive naturals, namely, 2562245 + ... + 2562276.

Almost surely, 2^81992336 is an apocalyptic number.

It is an amenable number.

81992336 is a deficient number, since it is larger than the sum of its proper divisors (76867846).

81992336 is a wasteful number, since it uses less digits than its factorization.

81992336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124529 (or 5124523 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 81992336 is about 9054.9619546412. The cubic root of 81992336 is about 434.4346131527.

It can be divided in two parts, 81992 and 336, that added together give a palindrome (82328).

The spelling of 81992336 in words is "eighty-one million, nine hundred ninety-two thousand, three hundred thirty-six".