640466226 has 24 divisors (see below), whose sum is σ = 1425183084. Its totient is φ = 207718560.

The previous prime is 640466213. The next prime is 640466237. The reversal of 640466226 is 622664046.

640466226 is a `hidden beast` number, since 640 + 4 + 6 + 6 + 2 + 2 + 6 = 666.

640466226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 640343025 + 123201 = 25305^2 + 351^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480165 + ... + 481496.

Almost surely, 2^640466226 is an apocalyptic number.

640466226 is an abundant number, since it is smaller than the sum of its proper divisors (784716858).

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

640466226 is a wasteful number, since it uses less digits than its factorization.

640466226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961706 (or 961703 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 640466226 is about 25307.4342042017. The cubic root of 640466226 is about 861.9830863584.

The spelling of 640466226 in words is "six hundred forty million, four hundred sixty-six thousand, two hundred twenty-six".