28890003 has 8 divisors (see below), whose sum is σ = 39848400. Its totient is φ = 18595808.

The previous prime is 28889989. The next prime is 28890031. The reversal of 28890003 is 30009882.

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

It is a cyclic number.

It is not a de Polignac number, because 28890003 - 2²¹ = 26792851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28890053) 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, 165948 + ... + 166121.

It is an arithmetic number, because the mean of its divisors is an integer number (4981050).

Almost surely, 2^28890003 is an apocalyptic number.

28890003 is a deficient number, since it is larger than the sum of its proper divisors (10958397).

28890003 is a wasteful number, since it uses less digits than its factorization.

28890003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332101.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28890003 is about 5374.9421392235. The cubic root of 28890003 is about 306.8427471520.

Adding to 28890003 its reverse (30009882), we get a palindrome (58899885).

The spelling of 28890003 in words is "twenty-eight million, eight hundred ninety thousand, three".