28478828 has 24 divisors (see below), whose sum is σ = 57926400. Its totient is φ = 11997648.

The previous prime is 28478809. The next prime is 28478839. The reversal of 28478828 is 82887482.

It is a happy number.

It is a super-2 number, since 2×28478828² = 1622087288507168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6968 + ... + 10271.

It is an arithmetic number, because the mean of its divisors is an integer number (2413600).

Almost surely, 2^28478828 is an apocalyptic number.

28478828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28478828 is an abundant number, since it is smaller than the sum of its proper divisors (29447572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28478828 is a wasteful number, since it uses less digits than its factorization.

28478828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17309 (or 17307 counting only the distinct ones).

The product of its digits is 458752, while the sum is 47.

The square root of 28478828 is about 5336.5558181284. Note that the first 3 decimals coincide. The cubic root of 28478828 is about 305.3800797764.

The spelling of 28478828 in words is "twenty-eight million, four hundred seventy-eight thousand, eight hundred twenty-eight".