667469 has 4 divisors (see below), whose sum is σ = 728160. Its totient is φ = 606780.

The previous prime is 667463. The next prime is 667477. The reversal of 667469 is 964766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667469 is a prime.

It is a super-2 number, since 2×667469² = 891029731922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30329 + ... + 30350.

It is an arithmetic number, because the mean of its divisors is an integer number (182040).

2⁶⁶⁷⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

667469 is a deficient number, since it is larger than the sum of its proper divisors (60691).

667469 is a wasteful number, since it uses less digits than its factorization.

667469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60690.

The product of its digits is 54432, while the sum is 38.

The square root of 667469 is about 816.9877600062. The cubic root of 667469 is about 87.3930775604.

The spelling of 667469 in words is "six hundred sixty-seven thousand, four hundred sixty-nine".