68490871 has 2 divisors, whose sum is σ = 68490872. Its totient is φ = 68490870.

The previous prime is 68490857. The next prime is 68490889. The reversal of 68490871 is 17809486.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68490871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68490371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34245435 + 34245436.

It is an arithmetic number, because the mean of its divisors is an integer number (34245436).

Almost surely, 2^68490871 is an apocalyptic number.

68490871 is a deficient number, since it is larger than the sum of its proper divisors (1).

68490871 is an equidigital number, since it uses as much as digits as its factorization.

68490871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 68490871 is about 8275.9211571885. The cubic root of 68490871 is about 409.1452966238.

The spelling of 68490871 in words is "sixty-eight million, four hundred ninety thousand, eight hundred seventy-one".