646424226 has 96 divisors (see below), whose sum is σ = 1673118720. Its totient is φ = 183229776.

The previous prime is 646424209. The next prime is 646424227. The reversal of 646424226 is 622424646.

646424226 is a `hidden beast` number, since 6 + 4 + 6 + 424 + 226 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646424227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 472195 + ... + 473561.

It is an arithmetic number, because the mean of its divisors is an integer number (17428320).

Almost surely, 2^646424226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646424226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (836559360).

646424226 is an abundant number, since it is smaller than the sum of its proper divisors (1026694494).

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

646424226 is a wasteful number, since it uses less digits than its factorization.

646424226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530 (or 1518 counting only the distinct ones).

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

The square root of 646424226 is about 25424.8741589806. The cubic root of 646424226 is about 864.6477347625.

The spelling of 646424226 in words is "six hundred forty-six million, four hundred twenty-four thousand, two hundred twenty-six".