28228620 has 48 divisors (see below), whose sum is σ = 90332928. Its totient is φ = 6452160.

The previous prime is 28228573. The next prime is 28228621. The reversal of 28228620 is 2682282.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28228621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33186 + ... + 34025.

It is an arithmetic number, because the mean of its divisors is an integer number (1881936).

Almost surely, 2^28228620 is an apocalyptic number.

28228620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28228620 is an abundant number, since it is smaller than the sum of its proper divisors (62104308).

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

28228620 is a wasteful number, since it uses less digits than its factorization.

28228620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67230 (or 67228 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28228620 is about 5313.0612644689. The cubic root of 28228620 is about 304.4831162901.

The spelling of 28228620 in words is "twenty-eight million, two hundred twenty-eight thousand, six hundred twenty".