68543987 has 2 divisors, whose sum is σ = 68543988. Its totient is φ = 68543986.

The previous prime is 68543957. The next prime is 68543989. The reversal of 68543987 is 78934586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68543987 is a prime.

Together with 68543989, 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 (68543989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34271993 + 34271994.

It is an arithmetic number, because the mean of its divisors is an integer number (34271994).

Almost surely, 2^68543987 is an apocalyptic number.

68543987 is a deficient number, since it is larger than the sum of its proper divisors (1).

68543987 is an equidigital number, since it uses as much as digits as its factorization.

68543987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 50.

The square root of 68543987 is about 8279.1296040103. The cubic root of 68543987 is about 409.2510360009.

The spelling of 68543987 in words is "sixty-eight million, five hundred forty-three thousand, nine hundred eighty-seven".