28258284 has 48 divisors (see below), whose sum is σ = 70834176. Its totient is φ = 8736000.

The previous prime is 28258277. The next prime is 28258289. The reversal of 28258284 is 48285282.

It is a super-2 number, since 2×28258284² = 1597061229249312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28258289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13509 + ... + 15459.

It is an arithmetic number, because the mean of its divisors is an integer number (1475712).

Almost surely, 2^28258284 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 28258284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35417088).

28258284 is an abundant number, since it is smaller than the sum of its proper divisors (42575892).

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

28258284 is a wasteful number, since it uses less digits than its factorization.

28258284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046 (or 2044 counting only the distinct ones).

The product of its digits is 81920, while the sum is 39.

The square root of 28258284 is about 5315.8521424133. The cubic root of 28258284 is about 304.5897341504.

The spelling of 28258284 in words is "twenty-eight million, two hundred fifty-eight thousand, two hundred eighty-four".