67999 has 4 divisors (see below), whose sum is σ = 69336. Its totient is φ = 66664.

The previous prime is 67993. The next prime is 68023. The reversal of 67999 is 99976.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67999 - 2⁵ = 67967 is a prime.

It is a Duffinian number.

67999 is a modest number, since divided by 999 gives 67 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589 + ... + 694.

It is an arithmetic number, because the mean of its divisors is an integer number (17334).

2⁶⁷⁹⁹⁹ is an apocalyptic number.

67999 is a deficient number, since it is larger than the sum of its proper divisors (1337).

67999 is a wasteful number, since it uses less digits than its factorization.

67999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336.

The product of its digits is 30618, while the sum is 40.

The square root of 67999 is about 260.7661787886. The cubic root of 67999 is about 40.8163509371.

The spelling of 67999 in words is "sixty-seven thousand, nine hundred ninety-nine".