28199403 has 18 divisors (see below), whose sum is σ = 42587636. Its totient is φ = 17979192.

The previous prime is 28199393. The next prime is 28199407. The reversal of 28199403 is 30499182.

It is not a de Polignac number, because 28199403 - 2¹⁷ = 28068331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28199407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1800 + ... + 7722.

Almost surely, 2^28199403 is an apocalyptic number.

28199403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28199403 is a deficient number, since it is larger than the sum of its proper divisors (14388233).

28199403 is a wasteful number, since it uses less digits than its factorization.

28199403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5975 (or 5949 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28199403 is about 5310.3110078413. The cubic root of 28199403 is about 304.3780319920.

The spelling of 28199403 in words is "twenty-eight million, one hundred ninety-nine thousand, four hundred three".