189128268 has 36 divisors (see below), whose sum is σ = 546371280. Its totient is φ = 54036576.

The previous prime is 189128231. The next prime is 189128279. The reversal of 189128268 is 862821981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375003 + ... + 375506.

It is an arithmetic number, because the mean of its divisors is an integer number (15176980).

Almost surely, 2^189128268 is an apocalyptic number.

189128268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189128268 is an abundant number, since it is smaller than the sum of its proper divisors (357243012).

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

189128268 is a wasteful number, since it uses less digits than its factorization.

189128268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750526 (or 750521 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 189128268 is about 13752.3913556879. The cubic root of 189128268 is about 574.0091497366.

The spelling of 189128268 in words is "one hundred eighty-nine million, one hundred twenty-eight thousand, two hundred sixty-eight".