81045536 has 96 divisors (see below), whose sum is σ = 190512000. Its totient is φ = 33454080.

The previous prime is 81045529. The next prime is 81045557. The reversal of 81045536 is 63554018.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407165 + ... + 407363.

It is an arithmetic number, because the mean of its divisors is an integer number (1984500).

Almost surely, 2^81045536 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 81045536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95256000).

81045536 is an abundant number, since it is smaller than the sum of its proper divisors (109466464).

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

81045536 is a wasteful number, since it uses less digits than its factorization.

81045536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 81045536 is about 9002.5294223346. The cubic root of 81045536 is about 432.7559352571.

The spelling of 81045536 in words is "eighty-one million, forty-five thousand, five hundred thirty-six".