28038403 has 4 divisors (see below), whose sum is σ = 29257488. Its totient is φ = 26819320.

The previous prime is 28038401. The next prime is 28038421. The reversal of 28038403 is 30483082.

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 28038403 - 2¹ = 28038401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28038401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609508 + ... + 609553.

It is an arithmetic number, because the mean of its divisors is an integer number (7314372).

Almost surely, 2^28038403 is an apocalyptic number.

28038403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28038403 is a deficient number, since it is larger than the sum of its proper divisors (1219085).

28038403 is a wasteful number, since it uses less digits than its factorization.

28038403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219084.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 28038403 is about 5295.1301211585. The cubic root of 28038403 is about 303.7976601083.

It can be divided in two parts, 28038 and 403, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28038403 in words is "twenty-eight million, thirty-eight thousand, four hundred three".