28175880 has 32 divisors (see below), whose sum is σ = 84528000. Its totient is φ = 7513536.

The previous prime is 28175857. The next prime is 28175891. The reversal of 28175880 is 8857182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117280 + ... + 117519.

It is an arithmetic number, because the mean of its divisors is an integer number (2641500).

Almost surely, 2^28175880 is an apocalyptic number.

28175880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28175880 is an abundant number, since it is smaller than the sum of its proper divisors (56352120).

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

28175880 is a wasteful number, since it uses less digits than its factorization.

28175880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234813 (or 234809 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28175880 is about 5308.0957037341. The cubic root of 28175880 is about 304.2933744525.

The spelling of 28175880 in words is "twenty-eight million, one hundred seventy-five thousand, eight hundred eighty".