19860761860 has 24 divisors (see below), whose sum is σ = 42391333656. Its totient is φ = 7814069760.

The previous prime is 19860761857. The next prime is 19860761873. The reversal of 19860761860 is 6816706891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54140164 + 19806621696 = 7358^2 + 140736^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19860761798 and 19860761807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8138437 + ... + 8140876.

It is an arithmetic number, because the mean of its divisors is an integer number (1766305569).

Almost surely, 2^19860761860 is an apocalyptic number.

19860761860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19860761860 is an abundant number, since it is smaller than the sum of its proper divisors (22530571796).

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

19860761860 is a wasteful number, since it uses less digits than its factorization.

19860761860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16279383 (or 16279381 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 19860761860 in words is "nineteen billion, eight hundred sixty million, seven hundred sixty-one thousand, eight hundred sixty".