28390033 has 16 divisors (see below), whose sum is σ = 33644160.
Its totient is φ = 23452416.
The previous prime is 28390003. The next prime is 28390091. The reversal of 28390033 is 33009382.
It is a happy number.
It is a cyclic number.
It is not a de Polignac number, because 28390033 - 25 = 28390001 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 28389983 and 28390010.
It is not an unprimeable number, because it can be changed into a prime (28390003) 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 15 ways as a sum of consecutive naturals, for example, 21241 + ... + 22537.
It is an arithmetic number, because the mean of its divisors is an integer number (2102760).
Almost surely, 228390033 is an apocalyptic number.
It is an amenable number.
28390033 is a deficient number, since it is larger than the sum of its proper divisors (5254127).
28390033 is a wasteful number, since it uses less digits than its factorization.
28390033 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1416.
The product of its (nonzero) digits is 3888, while the sum is 28.
The square root of 28390033 is about 5328.2298186171.
The cubic root of 28390033 is about 305.0623647442.
The spelling of 28390033 in words is "twenty-eight million, three hundred ninety thousand, thirty-three".