28444430 has 16 divisors (see below), whose sum is σ = 58514400. Its totient is φ = 9752352.

The previous prime is 28444421. The next prime is 28444433. The reversal of 28444430 is 3444482.

It is a junction number, because it is equal to n+sod(n) for n = 28444393 and 28444402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444433) 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 in 7 ways as a sum of consecutive naturals, for example, 203105 + ... + 203244.

It is an arithmetic number, because the mean of its divisors is an integer number (3657150).

Almost surely, 2^28444430 is an apocalyptic number.

28444430 is an abundant number, since it is smaller than the sum of its proper divisors (30069970).

28444430 is a wasteful number, since it uses less digits than its factorization.

28444430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406363.

The product of its (nonzero) digits is 12288, while the sum is 29.

The square root of 28444430 is about 5333.3319791665. The cubic root of 28444430 is about 305.2570796764.

The spelling of 28444430 in words is "twenty-eight million, four hundred forty-four thousand, four hundred thirty".