67998907 has 2 divisors, whose sum is σ = 67998908. Its totient is φ = 67998906.

The previous prime is 67998863. The next prime is 67998911. The reversal of 67998907 is 70989976.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67998907 is a prime.

It is not a weakly prime, because it can be changed into another prime (67998977) 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, 33999453 + 33999454.

It is an arithmetic number, because the mean of its divisors is an integer number (33999454).

Almost surely, 2^67998907 is an apocalyptic number.

67998907 is a deficient number, since it is larger than the sum of its proper divisors (1).

67998907 is an equidigital number, since it uses as much as digits as its factorization.

67998907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 67998907 is about 8246.1449781095. The cubic root of 67998907 is about 408.1633232932.

The spelling of 67998907 in words is "sixty-seven million, nine hundred ninety-eight thousand, nine hundred seven".