68945 has 4 divisors (see below), whose sum is σ = 82740. Its totient is φ = 55152.

The previous prime is 68927. The next prime is 68947. The reversal of 68945 is 54986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50176 + 18769 = 224^2 + 137^2 .

It is a cyclic number.

It is not a de Polignac number, because 68945 - 2⁶ = 68881 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (68947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6890 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (20685).

2⁶⁸⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

68945 is a deficient number, since it is larger than the sum of its proper divisors (13795).

68945 is a wasteful number, since it uses less digits than its factorization.

68945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13794.

The product of its digits is 8640, while the sum is 32.

The square root of 68945 is about 262.5737991499. The cubic root of 68945 is about 41.0047585197.

The spelling of 68945 in words is "sixty-eight thousand, nine hundred forty-five".