81454128 has 80 divisors (see below), whose sum is σ = 242246400. Its totient is φ = 23102208.

The previous prime is 81454103. The next prime is 81454133. The reversal of 81454128 is 82145418.

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, 49251 + ... + 50877.

It is an arithmetic number, because the mean of its divisors is an integer number (3028080).

Almost surely, 2^81454128 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 81454128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121123200).

81454128 is an abundant number, since it is smaller than the sum of its proper divisors (160792272).

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

81454128 is a wasteful number, since it uses less digits than its factorization.

81454128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1788 counting only the distinct ones).

The product of its digits is 10240, while the sum is 33.

The square root of 81454128 is about 9025.1940699356. The cubic root of 81454128 is about 433.4819645305.

The spelling of 81454128 in words is "eighty-one million, four hundred fifty-four thousand, one hundred twenty-eight".