220628128 has 24 divisors (see below), whose sum is σ = 496413792. Its totient is φ = 94554816.

The previous prime is 220628123. The next prime is 220628129. The reversal of 220628128 is 821826022.

It is a self number, because there is not a number n which added to its sum of digits gives 220628128.

It is not an unprimeable number, because it can be changed into a prime (220628123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492250 + ... + 492697.

It is an arithmetic number, because the mean of its divisors is an integer number (20683908).

Almost surely, 2^220628128 is an apocalyptic number.

220628128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

220628128 is an abundant number, since it is smaller than the sum of its proper divisors (275785664).

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

220628128 is an equidigital number, since it uses as much as digits as its factorization.

220628128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984964 (or 984956 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 220628128 is about 14853.5560725370. The cubic root of 220628128 is about 604.2550565270.

The spelling of 220628128 in words is "two hundred twenty million, six hundred twenty-eight thousand, one hundred twenty-eight".