28128876 has 12 divisors (see below), whose sum is σ = 65634072. Its totient is φ = 9376288.

The previous prime is 28128853. The next prime is 28128883. The reversal of 28128876 is 67882182.

It is a tau number, because it is divible by the number of its divisors (12).

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, 1172025 + ... + 1172048.

It is an arithmetic number, because the mean of its divisors is an integer number (5469506).

Almost surely, 2^28128876 is an apocalyptic number.

It is an amenable number.

28128876 is an abundant number, since it is smaller than the sum of its proper divisors (37505196).

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

28128876 is a wasteful number, since it uses less digits than its factorization.

28128876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344080 (or 2344078 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 28128876 is about 5303.6662790941. Note that the first 3 decimals coincide. The cubic root of 28128876 is about 304.1240692791.

The spelling of 28128876 in words is "twenty-eight million, one hundred twenty-eight thousand, eight hundred seventy-six".