68628491 has 2 divisors, whose sum is σ = 68628492. Its totient is φ = 68628490.

The previous prime is 68628449. The next prime is 68628493. The reversal of 68628491 is 19482686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68628491 is a prime.

Together with 68628493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68628493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34314245 + 34314246.

It is an arithmetic number, because the mean of its divisors is an integer number (34314246).

Almost surely, 2^68628491 is an apocalyptic number.

68628491 is a deficient number, since it is larger than the sum of its proper divisors (1).

68628491 is an equidigital number, since it uses as much as digits as its factorization.

68628491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 68628491 is about 8284.2314670704. The cubic root of 68628491 is about 409.4191477436.

The spelling of 68628491 in words is "sixty-eight million, six hundred twenty-eight thousand, four hundred ninety-one".