68780191 has 4 divisors (see below), whose sum is σ = 69608952. Its totient is φ = 67951432.

The previous prime is 68780183. The next prime is 68780219. The reversal of 68780191 is 19108786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68780191 - 2³ = 68780183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68780111) 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 3 ways as a sum of consecutive naturals, for example, 414256 + ... + 414421.

It is an arithmetic number, because the mean of its divisors is an integer number (17402238).

Almost surely, 2^68780191 is an apocalyptic number.

68780191 is a deficient number, since it is larger than the sum of its proper divisors (828761).

68780191 is an equidigital number, since it uses as much as digits as its factorization.

68780191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828760.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 68780191 is about 8293.3823618594. The cubic root of 68780191 is about 409.7205928966.

The spelling of 68780191 in words is "sixty-eight million, seven hundred eighty thousand, one hundred ninety-one".