189961728 has 80 divisors (see below), whose sum is σ = 552125376. Its totient is φ = 57559040.

The previous prime is 189961727. The next prime is 189961771. The reversal of 189961728 is 827169981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189961727) 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, 11275 + ... + 22517.

Almost surely, 2^189961728 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 189961728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276062688).

189961728 is an abundant number, since it is smaller than the sum of its proper divisors (362163648).

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

189961728 is a wasteful number, since it uses less digits than its factorization.

189961728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11275 (or 11259 counting only the distinct ones).

The product of its digits is 435456, while the sum is 51.

The square root of 189961728 is about 13782.6604108205. The cubic root of 189961728 is about 574.8511049886.

The spelling of 189961728 in words is "one hundred eighty-nine million, nine hundred sixty-one thousand, seven hundred twenty-eight".