28175856 has 80 divisors (see below), whose sum is σ = 75828480. Its totient is φ = 9008640.

The previous prime is 28175843. The next prime is 28175857. The reversal of 28175856 is 65857182.

It is a super-2 number, since 2×28175856² = 1587757722665472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28175857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202635 + ... + 202773.

It is an arithmetic number, because the mean of its divisors is an integer number (947856).

Almost surely, 2^28175856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28175856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37914240).

28175856 is an abundant number, since it is smaller than the sum of its proper divisors (47652624).

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

28175856 is a wasteful number, since it uses less digits than its factorization.

28175856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 288 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 28175856 is about 5308.0934430358. The cubic root of 28175856 is about 304.2932880542.

The spelling of 28175856 in words is "twenty-eight million, one hundred seventy-five thousand, eight hundred fifty-six".