28249843 has 2 divisors, whose sum is σ = 28249844. Its totient is φ = 28249842.

The previous prime is 28249831. The next prime is 28249877. The reversal of 28249843 is 34894282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28249843 - 2¹⁷ = 28118771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28249796 and 28249805.

It is not a weakly prime, because it can be changed into another prime (28249883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124921 + 14124922.

It is an arithmetic number, because the mean of its divisors is an integer number (14124922).

Almost surely, 2^28249843 is an apocalyptic number.

28249843 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249843 is an equidigital number, since it uses as much as digits as its factorization.

28249843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 28249843 is about 5315.0581370292. The cubic root of 28249843 is about 304.5594032454.

It can be divided in two parts, 28249 and 843, that added together give a palindrome (29092).

The spelling of 28249843 in words is "twenty-eight million, two hundred forty-nine thousand, eight hundred forty-three".