28508272 has 40 divisors (see below), whose sum is σ = 59909360. Its totient is φ = 13141440.

The previous prime is 28508267. The next prime is 28508281. The reversal of 28508272 is 27280582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34747 + ... + 35557.

It is an arithmetic number, because the mean of its divisors is an integer number (1497734).

Almost surely, 2^28508272 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 28508272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29954680).

28508272 is an abundant number, since it is smaller than the sum of its proper divisors (31401088).

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

28508272 is an equidigital number, since it uses as much as digits as its factorization.

28508272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28508272 is about 5339.3138135907. The cubic root of 28508272 is about 305.4852867518.

The spelling of 28508272 in words is "twenty-eight million, five hundred eight thousand, two hundred seventy-two".