28144873 has 2 divisors, whose sum is σ = 28144874. Its totient is φ = 28144872.

The previous prime is 28144867. The next prime is 28144903. The reversal of 28144873 is 37844182.

28144873 is nontrivially palindromic in base 8.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23785129 + 4359744 = 4877^2 + 2088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28144873 is a prime.

It is a super-2 number, since 2×28144873² = 1584267752372258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28141873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14072436 + 14072437.

It is an arithmetic number, because the mean of its divisors is an integer number (14072437).

Almost surely, 2^28144873 is an apocalyptic number.

It is an amenable number.

28144873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28144873 is an equidigital number, since it uses as much as digits as its factorization.

28144873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 28144873 is about 5305.1741724471. The cubic root of 28144873 is about 304.1817105297.

It can be divided in two parts, 281 and 44873, that added together give a palindrome (45154).

The spelling of 28144873 in words is "twenty-eight million, one hundred forty-four thousand, eight hundred seventy-three".