28394889 has 8 divisors (see below), whose sum is σ = 37920960. Its totient is φ = 18899376.

The previous prime is 28394887. The next prime is 28394893. The reversal of 28394889 is 98849382.

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 28394889 - 2¹ = 28394887 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28394887) 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, 5374 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (4740120).

Almost surely, 2^28394889 is an apocalyptic number.

It is an amenable number.

28394889 is a deficient number, since it is larger than the sum of its proper divisors (9526071).

28394889 is a wasteful number, since it uses less digits than its factorization.

28394889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15279.

The product of its digits is 995328, while the sum is 51.

The square root of 28394889 is about 5328.6854851830. The cubic root of 28394889 is about 305.0797569794.

The spelling of 28394889 in words is "twenty-eight million, three hundred ninety-four thousand, eight hundred eighty-nine".