28884881 has 2 divisors, whose sum is σ = 28884882. Its totient is φ = 28884880.

The previous prime is 28884871. The next prime is 28884893. The reversal of 28884881 is 18848882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23668225 + 5216656 = 4865^2 + 2284^2 .

It is a cyclic number.

It is not a de Polignac number, because 28884881 - 2²² = 24690577 is a prime.

It is a super-2 number, since 2×28884881² = 1668672700768322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28884811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14442440 + 14442441.

It is an arithmetic number, because the mean of its divisors is an integer number (14442441).

Almost surely, 2^28884881 is an apocalyptic number.

It is an amenable number.

28884881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28884881 is an equidigital number, since it uses as much as digits as its factorization.

28884881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262144, while the sum is 47.

The square root of 28884881 is about 5374.4656478575. The cubic root of 28884881 is about 306.8246123732.

The spelling of 28884881 in words is "twenty-eight million, eight hundred eighty-four thousand, eight hundred eighty-one".