68889391 has 2 divisors, whose sum is σ = 68889392. Its totient is φ = 68889390.

The previous prime is 68889377. The next prime is 68889427. The reversal of 68889391 is 19398886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68889391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68889341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34444695 + 34444696.

It is an arithmetic number, because the mean of its divisors is an integer number (34444696).

Almost surely, 2^68889391 is an apocalyptic number.

68889391 is a deficient number, since it is larger than the sum of its proper divisors (1).

68889391 is an equidigital number, since it uses as much as digits as its factorization.

68889391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 52.

The square root of 68889391 is about 8299.9633131719. The cubic root of 68889391 is about 409.9373114545.

The spelling of 68889391 in words is "sixty-eight million, eight hundred eighty-nine thousand, three hundred ninety-one".