68999 has 4 divisors (see below), whose sum is σ = 78864. Its totient is φ = 59136.

The previous prime is 68993. The next prime is 69001. The reversal of 68999 is 99986.

68999 = 47² + 48² + ... + 67².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99986 = 2 ⋅49993.

It is not a de Polignac number, because 68999 - 2⁸ = 68743 is a prime.

It is an Ulam number.

It is a Duffinian number.

68999 is a modest number, since divided by 999 gives 68 as remainder.

It is a plaindrome in base 10 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68993) 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, 4922 + ... + 4935.

It is an arithmetic number, because the mean of its divisors is an integer number (19716).

2⁶⁸⁹⁹⁹ is an apocalyptic number.

68999 is a deficient number, since it is larger than the sum of its proper divisors (9865).

68999 is an equidigital number, since it uses as much as digits as its factorization.

68999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9864.

The product of its digits is 34992, while the sum is 41.

The square root of 68999 is about 262.6766072569. The cubic root of 68999 is about 41.0154611528.

The spelling of 68999 in words is "sixty-eight thousand, nine hundred ninety-nine".