28389398 has 8 divisors (see below), whose sum is σ = 43062840. Its totient is φ = 14035120.

The previous prime is 28389391. The next prime is 28389407. The reversal of 28389398 is 89398382.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28389391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79568 + ... + 79923.

It is an arithmetic number, because the mean of its divisors is an integer number (5382855).

Almost surely, 2^28389398 is an apocalyptic number.

28389398 is a deficient number, since it is larger than the sum of its proper divisors (14673442).

28389398 is a wasteful number, since it uses less digits than its factorization.

28389398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159582.

The product of its digits is 746496, while the sum is 50.

The square root of 28389398 is about 5328.1702300133. The cubic root of 28389398 is about 305.0600902835.

The spelling of 28389398 in words is "twenty-eight million, three hundred eighty-nine thousand, three hundred ninety-eight".