68693891 has 8 divisors (see below), whose sum is σ = 78609504. Its totient is φ = 58803840.

The previous prime is 68693887. The next prime is 68693909. The reversal of 68693891 is 19839686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68693891 - 2² = 68693887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68693831) 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 7 ways as a sum of consecutive naturals, for example, 230 + ... + 11723.

It is an arithmetic number, because the mean of its divisors is an integer number (9826188).

Almost surely, 2^68693891 is an apocalyptic number.

68693891 is a deficient number, since it is larger than the sum of its proper divisors (9915613).

68693891 is a wasteful number, since it uses less digits than its factorization.

68693891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12781.

The product of its digits is 559872, while the sum is 50.

The square root of 68693891 is about 8288.1777852553. The cubic root of 68693891 is about 409.5491593996.

The spelling of 68693891 in words is "sixty-eight million, six hundred ninety-three thousand, eight hundred ninety-one".