28332403 has 4 divisors (see below), whose sum is σ = 30908088. Its totient is φ = 25756720.

The previous prime is 28332379. The next prime is 28332407. The reversal of 28332403 is 30423382.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28332403 - 2¹³ = 28324211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28332407) 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, 1287826 + ... + 1287847.

It is an arithmetic number, because the mean of its divisors is an integer number (7727022).

Almost surely, 2^28332403 is an apocalyptic number.

28332403 is a deficient number, since it is larger than the sum of its proper divisors (2575685).

28332403 is a wasteful number, since it uses less digits than its factorization.

28332403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575684.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 28332403 is about 5322.8190839066. The cubic root of 28332403 is about 304.8558057093.

Adding to 28332403 its reverse (30423382), we get a palindrome (58755785).

The spelling of 28332403 in words is "twenty-eight million, three hundred thirty-two thousand, four hundred three".