81053728 has 48 divisors (see below), whose sum is σ = 185492160. Its totient is φ = 34142976.

The previous prime is 81053723. The next prime is 81053737. The reversal of 81053728 is 82735018.

It is a junction number, because it is equal to n+sod(n) for n = 81053693 and 81053702.

It is not an unprimeable number, because it can be changed into a prime (81053723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10150 + ... + 16282.

It is an arithmetic number, because the mean of its divisors is an integer number (3864420).

Almost surely, 2^81053728 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 81053728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92746080).

81053728 is an abundant number, since it is smaller than the sum of its proper divisors (104438432).

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

81053728 is a wasteful number, since it uses less digits than its factorization.

81053728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6209 (or 6201 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 81053728 is about 9002.9843940773. The cubic root of 81053728 is about 432.7705156084.

The spelling of 81053728 in words is "eighty-one million, fifty-three thousand, seven hundred twenty-eight".