28175388 has 12 divisors (see below), whose sum is σ = 65742600. Its totient is φ = 9391792.

The previous prime is 28175369. The next prime is 28175393. The reversal of 28175388 is 88357182.

It is a happy number.

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

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, 1173963 + ... + 1173986.

It is an arithmetic number, because the mean of its divisors is an integer number (5478550).

Almost surely, 2^28175388 is an apocalyptic number.

It is an amenable number.

28175388 is an abundant number, since it is smaller than the sum of its proper divisors (37567212).

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

28175388 is a wasteful number, since it uses less digits than its factorization.

28175388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347956 (or 2347954 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 28175388 is about 5308.0493592279. The cubic root of 28175388 is about 304.2916032779.

The spelling of 28175388 in words is "twenty-eight million, one hundred seventy-five thousand, three hundred eighty-eight".