28543403 has 4 divisors (see below), whose sum is σ = 32621040. Its totient is φ = 24465768.

The previous prime is 28543399. The next prime is 28543439. The reversal of 28543403 is 30434582.

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

It is a cyclic number.

It is not a de Polignac number, because 28543403 - 2² = 28543399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28542403) 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, 2038808 + ... + 2038821.

It is an arithmetic number, because the mean of its divisors is an integer number (8155260).

Almost surely, 2^28543403 is an apocalyptic number.

28543403 is a deficient number, since it is larger than the sum of its proper divisors (4077637).

28543403 is an equidigital number, since it uses as much as digits as its factorization.

28543403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077636.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 28543403 is about 5342.6026429073. The cubic root of 28543403 is about 305.6107193308.

Adding to 28543403 its reverse (30434582), we get a palindrome (58977985).

The spelling of 28543403 in words is "twenty-eight million, five hundred forty-three thousand, four hundred three".