6640469 has 4 divisors (see below), whose sum is σ = 7244160. Its totient is φ = 6036780.

The previous prime is 6640463. The next prime is 6640477. The reversal of 6640469 is 9640466.

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 not a de Polignac number, because 6640469 - 2⁴ = 6640453 is a prime.

It is a super-2 number, since 2×6640469² = 88191657079922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640463) 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, 301829 + ... + 301850.

It is an arithmetic number, because the mean of its divisors is an integer number (1811040).

Almost surely, 2^6640469 is an apocalyptic number.

It is an amenable number.

6640469 is a deficient number, since it is larger than the sum of its proper divisors (603691).

6640469 is a wasteful number, since it uses less digits than its factorization.

6640469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603690.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 6640469 is about 2576.9107473873. The cubic root of 6640469 is about 187.9603526624.

The spelling of 6640469 in words is "six million, six hundred forty thousand, four hundred sixty-nine".