189217280 has 80 divisors (see below), whose sum is σ = 518538240. Its totient is φ = 64868352.

The previous prime is 189217279. The next prime is 189217289. The reversal of 189217280 is 82712981.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189217289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12641 + ... + 23199.

It is an arithmetic number, because the mean of its divisors is an integer number (6481728).

Almost surely, 2^189217280 is an apocalyptic number.

189217280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189217280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259269120).

189217280 is an abundant number, since it is smaller than the sum of its proper divisors (329320960).

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

189217280 is an equidigital number, since it uses as much as digits as its factorization.

189217280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10589 (or 10573 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 189217280 is about 13755.6272121630. The cubic root of 189217280 is about 574.0991868481.

The spelling of 189217280 in words is "one hundred eighty-nine million, two hundred seventeen thousand, two hundred eighty".