81366036 has 12 divisors (see below), whose sum is σ = 189854112. Its totient is φ = 27122008.

The previous prime is 81366011. The next prime is 81366053. The reversal of 81366036 is 63066318.

81366036 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 81365988 and 81366006.

It is a congruent number.

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, 3390240 + ... + 3390263.

It is an arithmetic number, because the mean of its divisors is an integer number (15821176).

Almost surely, 2^81366036 is an apocalyptic number.

It is an amenable number.

81366036 is an abundant number, since it is smaller than the sum of its proper divisors (108488076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81366036 is a wasteful number, since it uses less digits than its factorization.

81366036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780510 (or 6780508 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 81366036 is about 9020.3124114412. The cubic root of 81366036 is about 433.3256390481.

The spelling of 81366036 in words is "eighty-one million, three hundred sixty-six thousand, thirty-six".