664419 has 16 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 366240.

The previous prime is 664403. The next prime is 664421. The reversal of 664419 is 914466.

It is not a de Polignac number, because 664419 - 2⁴ = 664403 is a prime.

It is a super-2 number, since 2×664419² = 882905215122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (65520).

2⁶⁶⁴⁴¹⁹ is an apocalyptic number.

664419 is a deficient number, since it is larger than the sum of its proper divisors (383901).

664419 is a wasteful number, since it uses less digits than its factorization.

664419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its digits is 5184, while the sum is 30.

The square root of 664419 is about 815.1190097158. The cubic root of 664419 is about 87.2597600486.

Subtracting 664419 from its reverse (914466), we obtain a cube (250047 = 63³).

The spelling of 664419 in words is "six hundred sixty-four thousand, four hundred nineteen".