664244226 has 60 divisors (see below), whose sum is σ = 1507979682. Its totient is φ = 218528064.

The previous prime is 664244197. The next prime is 664244227. The reversal of 664244226 is 622442466.

664244226 is a `hidden beast` number, since 6 + 6 + 424 + 4 + 226 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 652853601 + 11390625 = 25551^2 + 3375^2 .

It is not an unprimeable number, because it can be changed into a prime (664244227) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3839476 + ... + 3839648.

Almost surely, 2^664244226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664244226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753989841).

664244226 is an abundant number, since it is smaller than the sum of its proper divisors (843735456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664244226 is a wasteful number, since it uses less digits than its factorization.

664244226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 315 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 664244226 is about 25772.9359212333. The cubic root of 664244226 is about 872.5210821309.

The spelling of 664244226 in words is "six hundred sixty-four million, two hundred forty-four thousand, two hundred twenty-six".