28043428 has 12 divisors (see below), whose sum is σ = 56086912. Its totient is φ = 12018600.

The previous prime is 28043423. The next prime is 28043441. The reversal of 28043428 is 82434082.

28043428 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28043428.

It is not an unprimeable number, because it can be changed into a prime (28043423) 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, 500748 + ... + 500803.

Almost surely, 2^28043428 is an apocalyptic number.

28043428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28043428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28043428 is a wasteful number, since it uses less digits than its factorization.

28043428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001562 (or 1001560 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 28043428 is about 5295.6045924899. The cubic root of 28043428 is about 303.8158077426.

The spelling of 28043428 in words is "twenty-eight million, forty-three thousand, four hundred twenty-eight".