28234581 has 8 divisors (see below), whose sum is σ = 37688064. Its totient is φ = 18802080.

The previous prime is 28234573. The next prime is 28234601. The reversal of 28234581 is 18543282.

28234581 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28234581 - 2³ = 28234573 is a prime.

It is a super-2 number, since 2×28234581² = 1594383128491122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28234511) 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, 1776 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (4711008).

Almost surely, 2^28234581 is an apocalyptic number.

It is an amenable number.

28234581 is a deficient number, since it is larger than the sum of its proper divisors (9453483).

28234581 is an equidigital number, since it uses as much as digits as its factorization.

28234581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10491.

The product of its digits is 15360, while the sum is 33.

The square root of 28234581 is about 5313.6222108840. The cubic root of 28234581 is about 304.5045472128.

The spelling of 28234581 in words is "twenty-eight million, two hundred thirty-four thousand, five hundred eighty-one".