668469 has 4 divisors (see below), whose sum is σ = 891296. Its totient is φ = 445644.

The previous prime is 668417. The next prime is 668471. The reversal of 668469 is 964866.

668469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 668469 - 2¹³ = 660277 is a prime.

It is a super-2 number, since 2×668469² = 893701607922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668069) 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, 111409 + ... + 111414.

It is an arithmetic number, because the mean of its divisors is an integer number (222824).

2⁶⁶⁸⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

668469 is a deficient number, since it is larger than the sum of its proper divisors (222827).

668469 is a wasteful number, since it uses less digits than its factorization.

668469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222826.

The product of its digits is 62208, while the sum is 39.

The square root of 668469 is about 817.5995352249. The cubic root of 668469 is about 87.4366997960.

The spelling of 668469 in words is "six hundred sixty-eight thousand, four hundred sixty-nine".