28383489 has 24 divisors (see below), whose sum is σ = 44913960. Its totient is φ = 17192448.

The previous prime is 28383469. The next prime is 28383497. The reversal of 28383489 is 98438382.

It can be written as a sum of positive squares in 4 ways, for example, as 1166400 + 27217089 = 1080^2 + 5217^2 .

It is not a de Polignac number, because 28383489 - 2¹³ = 28375297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28383409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1239 + ... + 7635.

It is an arithmetic number, because the mean of its divisors is an integer number (1871415).

Almost surely, 2^28383489 is an apocalyptic number.

28383489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28383489 is a deficient number, since it is larger than the sum of its proper divisors (16530471).

28383489 is a wasteful number, since it uses less digits than its factorization.

28383489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6449 (or 6446 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 28383489 is about 5327.6156955997. The cubic root of 28383489 is about 305.0389236358.

The spelling of 28383489 in words is "twenty-eight million, three hundred eighty-three thousand, four hundred eighty-nine".