191681868 has 96 divisors (see below), whose sum is σ = 544320000. Its totient is φ = 51250176.

The previous prime is 191681863. The next prime is 191681891. The reversal of 191681868 is 868186191.

It is not an unprimeable number, because it can be changed into a prime (191681863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383883 + ... + 384381.

It is an arithmetic number, because the mean of its divisors is an integer number (5670000).

Almost surely, 2^191681868 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 191681868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272160000).

191681868 is an abundant number, since it is smaller than the sum of its proper divisors (352638132).

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

191681868 is a wasteful number, since it uses less digits than its factorization.

191681868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799 (or 797 counting only the distinct ones).

The product of its digits is 165888, while the sum is 48.

The square root of 191681868 is about 13844.9221016227. The cubic root of 191681868 is about 576.5810229917.

The spelling of 191681868 in words is "one hundred ninety-one million, six hundred eighty-one thousand, eight hundred sixty-eight".