28478903 has 4 divisors (see below), whose sum is σ = 28517088. Its totient is φ = 28440720.

The previous prime is 28478897. The next prime is 28478917. The reversal of 28478903 is 30987482.

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 28478903 - 2⁶ = 28478839 is a prime.

It is a super-2 number, since 2×28478903² = 1622095832166818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478003) 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, 17951 + ... + 19472.

It is an arithmetic number, because the mean of its divisors is an integer number (7129272).

Almost surely, 2^28478903 is an apocalyptic number.

28478903 is a deficient number, since it is larger than the sum of its proper divisors (38185).

28478903 is an equidigital number, since it uses as much as digits as its factorization.

28478903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38184.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28478903 is about 5336.5628451279. The cubic root of 28478903 is about 305.3803478526.

The spelling of 28478903 in words is "twenty-eight million, four hundred seventy-eight thousand, nine hundred three".