228440128 has 28 divisors (see below), whose sum is σ = 518070592. Its totient is φ = 97902720.

The previous prime is 228440119. The next prime is 228440159. The reversal of 228440128 is 821044822.

It is a tau number, because it is divible by the number of its divisors (28).

It is a self number, because there is not a number n which added to its sum of digits gives 228440128.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 254508 + ... + 255403.

Almost surely, 2^228440128 is an apocalyptic number.

228440128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

228440128 is an abundant number, since it is smaller than the sum of its proper divisors (289630464).

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

228440128 is an equidigital number, since it uses as much as digits as its factorization.

228440128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509930 (or 509920 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 228440128 is about 15114.2359383463. The cubic root of 228440128 is about 611.3043200681.

The spelling of 228440128 in words is "two hundred twenty-eight million, four hundred forty thousand, one hundred twenty-eight".