189780081860 has 24 divisors (see below), whose sum is σ = 398549336640. Its totient is φ = 75909906144.

The previous prime is 189780081857. The next prime is 189780081871. The reversal of 189780081860 is 68180087981.

189780081860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 189780081796 and 189780081805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738071 + ... + 961409.

It is an arithmetic number, because the mean of its divisors is an integer number (16606222360).

Almost surely, 2^189780081860 is an apocalyptic number.

189780081860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189780081860 is an abundant number, since it is smaller than the sum of its proper divisors (208769254780).

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

189780081860 is a wasteful number, since it uses less digits than its factorization.

189780081860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265835 (or 265833 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 56.

The spelling of 189780081860 in words is "one hundred eighty-nine billion, seven hundred eighty million, eighty-one thousand, eight hundred sixty".