28905228 has 96 divisors (see below), whose sum is σ = 84672000. Its totient is φ = 8447040.

The previous prime is 28905223. The next prime is 28905229. The reversal of 28905228 is 82250982.

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 = 28905192 and 28905201.

It is not an unprimeable number, because it can be changed into a prime (28905223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34033 + ... + 34871.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^28905228 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 28905228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42336000).

28905228 is an abundant number, since it is smaller than the sum of its proper divisors (55766772).

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

28905228 is a wasteful number, since it uses less digits than its factorization.

28905228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28905228 is about 5376.3582469921. The cubic root of 28905228 is about 306.8966396168.

It can be divided in two parts, 2890 and 5228, that added together give a palindrome (8118).

The spelling of 28905228 in words is "twenty-eight million, nine hundred five thousand, two hundred twenty-eight".