67889999 has 2 divisors, whose sum is σ = 67890000. Its totient is φ = 67889998.

The previous prime is 67889981. The next prime is 67890007. The reversal of 67889999 is 99998876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67889999 - 2⁸ = 67889743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

67889999 is a modest number, since divided by 9999 gives 6788 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67889599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33944999 + 33945000.

It is an arithmetic number, because the mean of its divisors is an integer number (33945000).

Almost surely, 2^67889999 is an apocalyptic number.

67889999 is a deficient number, since it is larger than the sum of its proper divisors (1).

67889999 is an equidigital number, since it uses as much as digits as its factorization.

67889999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 65.

The square root of 67889999 is about 8239.5387613628. The cubic root of 67889999 is about 407.9453001607.

The spelling of 67889999 in words is "sixty-seven million, eight hundred eighty-nine thousand, nine hundred ninety-nine".