28440441 has 12 divisors (see below), whose sum is σ = 41206932. Its totient is φ = 18902016.

The previous prime is 28440427. The next prime is 28440449. The reversal of 28440441 is 14404482.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5198400 + 23242041 = 2280^2 + 4821^2 .

It is not a de Polignac number, because 28440441 - 2⁵ = 28440409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28440449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1656 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (3433911).

Almost surely, 2^28440441 is an apocalyptic number.

It is an amenable number.

28440441 is a deficient number, since it is larger than the sum of its proper divisors (12766491).

28440441 is a wasteful number, since it uses less digits than its factorization.

28440441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720 (or 9717 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 28440441 is about 5332.9579972094. The cubic root of 28440441 is about 305.2428094260.

The spelling of 28440441 in words is "twenty-eight million, four hundred forty thousand, four hundred forty-one".