28387441 has 2 divisors, whose sum is σ = 28387442. Its totient is φ = 28387440.

The previous prime is 28387423. The next prime is 28387487. The reversal of 28387441 is 14478382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 255025 = 5304^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 28387441 - 2⁵ = 28387409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28387441.

It is not a weakly prime, because it can be changed into another prime (28387141) 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 as a sum of consecutive naturals, namely, 14193720 + 14193721.

It is an arithmetic number, because the mean of its divisors is an integer number (14193721).

Almost surely, 2^28387441 is an apocalyptic number.

It is an amenable number.

28387441 is a deficient number, since it is larger than the sum of its proper divisors (1).

28387441 is an equidigital number, since it uses as much as digits as its factorization.

28387441 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 28387441 is about 5327.9865803134. The cubic root of 28387441 is about 305.0530804329.

The spelling of 28387441 in words is "twenty-eight million, three hundred eighty-seven thousand, four hundred forty-one".