28054581 has 16 divisors (see below), whose sum is σ = 38083584. Its totient is φ = 18367344.

The previous prime is 28054531. The next prime is 28054589. The reversal of 28054581 is 18545082.

It is not a de Polignac number, because 28054581 - 2¹⁵ = 28021813 is a prime.

It is a super-2 number, since 2×28054581² = 1574119030171122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28054589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76260 + ... + 76626.

It is an arithmetic number, because the mean of its divisors is an integer number (2380224).

Almost surely, 2^28054581 is an apocalyptic number.

It is an amenable number.

28054581 is a deficient number, since it is larger than the sum of its proper divisors (10029003).

28054581 is a wasteful number, since it uses less digits than its factorization.

28054581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 28054581 is about 5296.6575309340. The cubic root of 28054581 is about 303.8560787180.

The spelling of 28054581 in words is "twenty-eight million, fifty-four thousand, five hundred eighty-one".