28644469 has 12 divisors (see below), whose sum is σ = 33590784. Its totient is φ = 24353784.

The previous prime is 28644467. The next prime is 28644491. The reversal of 28644469 is 96444682.

It is not a de Polignac number, because 28644469 - 2¹ = 28644467 is a prime.

It is a super-2 number, since 2×28644469² = 1641011208583922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28644467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3922 + ... + 8524.

It is an arithmetic number, because the mean of its divisors is an integer number (2799232).

Almost surely, 2^28644469 is an apocalyptic number.

It is an amenable number.

28644469 is a deficient number, since it is larger than the sum of its proper divisors (4946315).

28644469 is a wasteful number, since it uses less digits than its factorization.

28644469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744 (or 4737 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The square root of 28644469 is about 5352.0527837457. The cubic root of 28644469 is about 305.9709948727.

The spelling of 28644469 in words is "twenty-eight million, six hundred forty-four thousand, four hundred sixty-nine".