28028844 has 18 divisors (see below), whose sum is σ = 70850780. Its totient is φ = 9342936.

The previous prime is 28028839. The next prime is 28028863. The reversal of 28028844 is 44882082.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 778579 = 28028844 / (2 + 8 + 0 + 2 + 8 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 28028799 and 28028808.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 389254 + ... + 389325.

Almost surely, 2^28028844 is an apocalyptic number.

It is an amenable number.

28028844 is an abundant number, since it is smaller than the sum of its proper divisors (42821936).

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

28028844 is a wasteful number, since it uses less digits than its factorization.

28028844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778589 (or 778584 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 28028844 is about 5294.2274223913. The cubic root of 28028844 is about 303.7631320848.

It can be divided in two parts, 28028 and 844, that multiplied together give a palindrome (23655632).

The spelling of 28028844 in words is "twenty-eight million, twenty-eight thousand, eight hundred forty-four".