81054336 has 128 divisors (see below), whose sum is σ = 242841600. Its totient is φ = 23731200.

The previous prime is 81054307. The next prime is 81054341. The reversal of 81054336 is 63345018.

It is a tau number, because it is divible by the number of its divisors (128).

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, 130635 + ... + 131253.

It is an arithmetic number, because the mean of its divisors is an integer number (1897200).

Almost surely, 2^81054336 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 81054336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121420800).

81054336 is an abundant number, since it is smaller than the sum of its proper divisors (161787264).

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

81054336 is a wasteful number, since it uses less digits than its factorization.

81054336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 666 counting only the distinct ones).

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

The square root of 81054336 is about 9003.0181605948. The cubic root of 81054336 is about 432.7715977047.

The spelling of 81054336 in words is "eighty-one million, fifty-four thousand, three hundred thirty-six".