28355928 has 32 divisors (see below), whose sum is σ = 72621360. Its totient is φ = 9221120.

The previous prime is 28355897. The next prime is 28355953. The reversal of 28355928 is 82955382.

It is a self number, because there is not a number n which added to its sum of digits gives 28355928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13425 + ... + 15392.

Almost surely, 2^28355928 is an apocalyptic number.

It is an amenable number.

28355928 is an abundant number, since it is smaller than the sum of its proper divisors (44265432).

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

28355928 is a wasteful number, since it uses less digits than its factorization.

28355928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28867 (or 28863 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 28355928 is about 5325.0284506282. The cubic root of 28355928 is about 304.9401584649.

The spelling of 28355928 in words is "twenty-eight million, three hundred fifty-five thousand, nine hundred twenty-eight".