28253128 has 16 divisors (see below), whose sum is σ = 53124480. Its totient is φ = 14086608.

The previous prime is 28253119. The next prime is 28253143. The reversal of 28253128 is 82135282.

It is a self number, because there is not a number n which added to its sum of digits gives 28253128.

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, 1876 + ... + 7747.

It is an arithmetic number, because the mean of its divisors is an integer number (3320280).

Almost surely, 2^28253128 is an apocalyptic number.

It is an amenable number.

28253128 is a deficient number, since it is larger than the sum of its proper divisors (24871352).

28253128 is a wasteful number, since it uses less digits than its factorization.

28253128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9996 (or 9992 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 28253128 is about 5315.3671557099. The cubic root of 28253128 is about 304.5712078993.

The spelling of 28253128 in words is "twenty-eight million, two hundred fifty-three thousand, one hundred twenty-eight".