28527228 has 54 divisors (see below), whose sum is σ = 74949056. Its totient is φ = 9500328.

The previous prime is 28527221. The next prime is 28527251. The reversal of 28527228 is 82272582.

It is a tau number, because it is divible by the number of its divisors (54).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28527192 and 28527201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28527221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25701 + ... + 26787.

Almost surely, 2^28527228 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 28527228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37474528).

28527228 is an abundant number, since it is smaller than the sum of its proper divisors (46421828).

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

28527228 is an equidigital number, since it uses as much as digits as its factorization.

28527228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1092 counting only the distinct ones).

The product of its digits is 35840, while the sum is 36.

The square root of 28527228 is about 5341.0886530744. The cubic root of 28527228 is about 305.5529805084.

The spelling of 28527228 in words is "twenty-eight million, five hundred twenty-seven thousand, two hundred twenty-eight".