68861891 has 8 divisors (see below), whose sum is σ = 78787680. Its totient is φ = 58958208.

The previous prime is 68861887. The next prime is 68861899. The reversal of 68861891 is 19816886.

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 68861891 - 2² = 68861887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68861899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1805 + ... + 11873.

It is an arithmetic number, because the mean of its divisors is an integer number (9848460).

Almost surely, 2^68861891 is an apocalyptic number.

68861891 is a deficient number, since it is larger than the sum of its proper divisors (9925789).

68861891 is a wasteful number, since it uses less digits than its factorization.

68861891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11053.

The product of its digits is 165888, while the sum is 47.

The square root of 68861891 is about 8298.3065139822. The cubic root of 68861891 is about 409.8827564822.

The spelling of 68861891 in words is "sixty-eight million, eight hundred sixty-one thousand, eight hundred ninety-one".