28183989 has 8 divisors (see below), whose sum is σ = 37646752. Its totient is φ = 18755280.

The previous prime is 28183957. The next prime is 28183997. The reversal of 28183989 is 98938182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28183989 - 2⁵ = 28183957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28183489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6514 + ... + 9939.

It is an arithmetic number, because the mean of its divisors is an integer number (4705844).

Almost surely, 2^28183989 is an apocalyptic number.

It is an amenable number.

28183989 is a deficient number, since it is larger than the sum of its proper divisors (9462763).

28183989 is a wasteful number, since it uses less digits than its factorization.

28183989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17027.

The product of its digits is 248832, while the sum is 48.

The square root of 28183989 is about 5308.8594820357. The cubic root of 28183989 is about 304.3225634645.

The spelling of 28183989 in words is "twenty-eight million, one hundred eighty-three thousand, nine hundred eighty-nine".