228667128 has 32 divisors (see below), whose sum is σ = 601756800. Its totient is φ = 72210528.

The previous prime is 228667123. The next prime is 228667133. The reversal of 228667128 is 821766822.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (228667123) and next prime (228667133).

It is a self number, because there is not a number n which added to its sum of digits gives 228667128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228667123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250276 + ... + 251187.

It is an arithmetic number, because the mean of its divisors is an integer number (18804900).

Almost surely, 2^228667128 is an apocalyptic number.

It is an amenable number.

228667128 is an abundant number, since it is smaller than the sum of its proper divisors (373089672).

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

228667128 is a wasteful number, since it uses less digits than its factorization.

228667128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501491 (or 501487 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 228667128 is about 15121.7435502656. The cubic root of 228667128 is about 611.5067365517.

The spelling of 228667128 in words is "two hundred twenty-eight million, six hundred sixty-seven thousand, one hundred twenty-eight".