664226 has 4 divisors (see below), whose sum is σ = 996342. Its totient is φ = 332112.

The previous prime is 664211. The next prime is 664243. The reversal of 664226 is 622466.

664226 is nontrivially palindromic in base 8.

It is a Cunningham number, because it is equal to 815²+1.

664226 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 1 = 815^2 + 1^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664195 and 664204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166055 + ... + 166058.

2⁶⁶⁴²²⁶ is an apocalyptic number.

664226 is a deficient number, since it is larger than the sum of its proper divisors (332116).

664226 is a wasteful number, since it uses less digits than its factorization.

664226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332115.

The product of its digits is 3456, while the sum is 26.

The square root of 664226 is about 815.0006134967. Note that the first 3 decimals coincide. The cubic root of 664226 is about 87.2513101776.

The spelling of 664226 in words is "six hundred sixty-four thousand, two hundred twenty-six".