28478229 has 16 divisors (see below), whose sum is σ = 40996032. Its totient is φ = 17480448.

The previous prime is 28478201. The next prime is 28478237. The reversal of 28478229 is 92287482.

It is not a de Polignac number, because 28478229 - 2⁷ = 28478101 is a prime.

It is a super-2 number, since 2×28478229² = 1622019053952882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21309 + ... + 22605.

It is an arithmetic number, because the mean of its divisors is an integer number (2562252).

Almost surely, 2^28478229 is an apocalyptic number.

It is an amenable number.

28478229 is a deficient number, since it is larger than the sum of its proper divisors (12517803).

28478229 is a wasteful number, since it uses less digits than its factorization.

28478229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

The product of its digits is 129024, while the sum is 42.

The square root of 28478229 is about 5336.4996954933. The cubic root of 28478229 is about 305.3779387245.

The spelling of 28478229 in words is "twenty-eight million, four hundred seventy-eight thousand, two hundred twenty-nine".