68443891 has 8 divisors (see below), whose sum is σ = 71049024. Its totient is φ = 65886720.

The previous prime is 68443889. The next prime is 68443897. The reversal of 68443891 is 19834486.

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 68443891 - 2¹ = 68443889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68443897) 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, 9070 + ... + 14803.

It is an arithmetic number, because the mean of its divisors is an integer number (8881128).

Almost surely, 2^68443891 is an apocalyptic number.

68443891 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

68443891 is a deficient number, since it is larger than the sum of its proper divisors (2605133).

68443891 is a wasteful number, since it uses less digits than its factorization.

68443891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23981.

The product of its digits is 165888, while the sum is 43.

The square root of 68443891 is about 8273.0823155581. The cubic root of 68443891 is about 409.0517267688.

The spelling of 68443891 in words is "sixty-eight million, four hundred forty-three thousand, eight hundred ninety-one".