189987680 has 48 divisors (see below), whose sum is σ = 449671824. Its totient is φ = 75855360.

The previous prime is 189987661. The next prime is 189987689. The reversal of 189987680 is 86789981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189987689) 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, 162779 + ... + 163941.

It is an arithmetic number, because the mean of its divisors is an integer number (9368163).

Almost surely, 2^189987680 is an apocalyptic number.

189987680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189987680 is an abundant number, since it is smaller than the sum of its proper divisors (259684144).

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

189987680 is a wasteful number, since it uses less digits than its factorization.

189987680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199 (or 2191 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 189987680 is about 13783.6018514755. The cubic root of 189987680 is about 574.8772819396.

The spelling of 189987680 in words is "one hundred eighty-nine million, nine hundred eighty-seven thousand, six hundred eighty".