28175420 has 96 divisors (see below), whose sum is σ = 74003328. Its totient is φ = 8773632.

The previous prime is 28175417. The next prime is 28175447. The reversal of 28175420 is 2457182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205592 + ... + 205728.

It is an arithmetic number, because the mean of its divisors is an integer number (770868).

Almost surely, 2^28175420 is an apocalyptic number.

28175420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28175420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37001664).

28175420 is an abundant number, since it is smaller than the sum of its proper divisors (45827908).

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

28175420 is a wasteful number, since it uses less digits than its factorization.

28175420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 28175420 is about 5308.0523735171. The cubic root of 28175420 is about 304.2917184769.

The spelling of 28175420 in words is "twenty-eight million, one hundred seventy-five thousand, four hundred twenty".