667797 has 8 divisors (see below), whose sum is σ = 958944. Its totient is φ = 410928.

The previous prime is 667781. The next prime is 667801. The reversal of 667797 is 797766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667797 - 2⁴ = 667781 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8523 + ... + 8600.

It is an arithmetic number, because the mean of its divisors is an integer number (119868).

2⁶⁶⁷⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

667797 is a deficient number, since it is larger than the sum of its proper divisors (291147).

667797 is a wasteful number, since it uses less digits than its factorization.

667797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17139.

The product of its digits is 111132, while the sum is 42.

The square root of 667797 is about 817.1884727528. The cubic root of 667797 is about 87.4073904525.

The spelling of 667797 in words is "six hundred sixty-seven thousand, seven hundred ninety-seven".