28380003 has 16 divisors (see below), whose sum is σ = 38860800. Its totient is φ = 18416160.

The previous prime is 28379993. The next prime is 28380019. The reversal of 28380003 is 30008382.

It is not a de Polignac number, because 28380003 - 2¹⁰ = 28378979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28380083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18558 + ... + 20028.

It is an arithmetic number, because the mean of its divisors is an integer number (2428800).

Almost surely, 2^28380003 is an apocalyptic number.

28380003 is a deficient number, since it is larger than the sum of its proper divisors (10480797).

28380003 is a wasteful number, since it uses less digits than its factorization.

28380003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28380003 is about 5327.2885223160. The cubic root of 28380003 is about 305.0264350464.

Adding to 28380003 its reverse (30008382), we get a palindrome (58388385).

The spelling of 28380003 in words is "twenty-eight million, three hundred eighty thousand, three".