81045584 has 20 divisors (see below), whose sum is σ = 157356000. Its totient is φ = 40437600.

The previous prime is 81045581. The next prime is 81045589. The reversal of 81045584 is 48554018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81045581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2909 + ... + 13059.

It is an arithmetic number, because the mean of its divisors is an integer number (7867800).

Almost surely, 2^81045584 is an apocalyptic number.

It is an amenable number.

81045584 is a deficient number, since it is larger than the sum of its proper divisors (76310416).

81045584 is a wasteful number, since it uses less digits than its factorization.

81045584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10658 (or 10652 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 81045584 is about 9002.5320882516. The cubic root of 81045584 is about 432.7560206917.

The spelling of 81045584 in words is "eighty-one million, forty-five thousand, five hundred eighty-four".