28028828 has 12 divisors (see below), whose sum is σ = 49352520. Its totient is φ = 13928112.

The previous prime is 28028807. The next prime is 28028839. The reversal of 28028828 is 82882082.

It is a junction number, because it is equal to n+sod(n) for n = 28028791 and 28028800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20843 + ... + 22146.

It is an arithmetic number, because the mean of its divisors is an integer number (4112710).

Almost surely, 2^28028828 is an apocalyptic number.

It is an amenable number.

28028828 is a deficient number, since it is larger than the sum of its proper divisors (21323692).

28028828 is a wasteful number, since it uses less digits than its factorization.

28028828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43156 (or 43154 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 38.

The square root of 28028828 is about 5294.2259113113. The cubic root of 28028828 is about 303.7630742847.

The spelling of 28028828 in words is "twenty-eight million, twenty-eight thousand, eight hundred twenty-eight".