189455728 has 80 divisors (see below), whose sum is σ = 462398976. Its totient is φ = 73048320.

The previous prime is 189455723. The next prime is 189455729. The reversal of 189455728 is 827554981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189455723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126150 + ... + 127642.

Almost surely, 2^189455728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189455728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231199488).

189455728 is an abundant number, since it is smaller than the sum of its proper divisors (272943248).

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

189455728 is a wasteful number, since it uses less digits than its factorization.

189455728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622 (or 1616 counting only the distinct ones).

The product of its digits is 806400, while the sum is 49.

The square root of 189455728 is about 13764.2917725541. The cubic root of 189455728 is about 574.3402418933.

The spelling of 189455728 in words is "one hundred eighty-nine million, four hundred fifty-five thousand, seven hundred twenty-eight".