28355628 has 48 divisors (see below), whose sum is σ = 76590080. Its totient is φ = 7997184.

The previous prime is 28355627. The next prime is 28355629. The reversal of 28355628 is 82655382.

It is an interprime number because it is at equal distance from previous prime (28355627) and next prime (28355629).

It is not an unprimeable number, because it can be changed into a prime (28355623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4500 + ... + 8772.

Almost surely, 2^28355628 is an apocalyptic number.

28355628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28355628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38295040).

28355628 is an abundant number, since it is smaller than the sum of its proper divisors (48234452).

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

28355628 is a wasteful number, since it uses less digits than its factorization.

28355628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366 (or 4364 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 28355628 is about 5325.0002816901. Note that the first 3 decimals coincide. The cubic root of 28355628 is about 304.9390830593.

The spelling of 28355628 in words is "twenty-eight million, three hundred fifty-five thousand, six hundred twenty-eight".