68434987 has 2 divisors, whose sum is σ = 68434988. Its totient is φ = 68434986.

The previous prime is 68434981. The next prime is 68434991. The reversal of 68434987 is 78943486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68434987 - 2¹⁵ = 68402219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68434987.

It is not a weakly prime, because it can be changed into another prime (68434981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34217493 + 34217494.

It is an arithmetic number, because the mean of its divisors is an integer number (34217494).

Almost surely, 2^68434987 is an apocalyptic number.

68434987 is a deficient number, since it is larger than the sum of its proper divisors (1).

68434987 is an equidigital number, since it uses as much as digits as its factorization.

68434987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 68434987 is about 8272.5441673043. The cubic root of 68434987 is about 409.0339878858.

The spelling of 68434987 in words is "sixty-eight million, four hundred thirty-four thousand, nine hundred eighty-seven".