81045336 has 64 divisors (see below), whose sum is σ = 214502400. Its totient is φ = 25446528.

The previous prime is 81045323. The next prime is 81045373. The reversal of 81045336 is 63354018.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 101290 + ... + 102086.

It is an arithmetic number, because the mean of its divisors is an integer number (3351600).

Almost surely, 2^81045336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81045336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107251200).

81045336 is an abundant number, since it is smaller than the sum of its proper divisors (133457064).

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

81045336 is a wasteful number, since it uses less digits than its factorization.

81045336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 81045336 is about 9002.5183143385. The cubic root of 81045336 is about 432.7555792792.

The spelling of 81045336 in words is "eighty-one million, forty-five thousand, three hundred thirty-six".