67997 has 4 divisors (see below), whose sum is σ = 68796. Its totient is φ = 67200.

The previous prime is 67993. The next prime is 68023. The reversal of 67997 is 79976.

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 45796 + 22201 = 214^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 67997 - 2² = 67993 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 67997.

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, 254 + ... + 447.

It is an arithmetic number, because the mean of its divisors is an integer number (17199).

2⁶⁷⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

67997 is a deficient number, since it is larger than the sum of its proper divisors (799).

67997 is an equidigital number, since it uses as much as digits as its factorization.

67997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798.

The product of its digits is 23814, while the sum is 38.

The square root of 67997 is about 260.7623439072. The cubic root of 67997 is about 40.8159507669.

The spelling of 67997 in words is "sixty-seven thousand, nine hundred ninety-seven".