640006226 has 8 divisors (see below), whose sum is σ = 965313804. Its totient is φ = 318234960.

The previous prime is 640006207. The next prime is 640006229. The reversal of 640006226 is 622600046.

It can be written as a sum of positive squares in 2 ways, for example, as 607573201 + 32433025 = 24649^2 + 5695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 640006195 and 640006204.

It is not an unprimeable number, because it can be changed into a prime (640006229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 883625 + ... + 884348.

Almost surely, 2^640006226 is an apocalyptic number.

640006226 is a deficient number, since it is larger than the sum of its proper divisors (325307578).

640006226 is a wasteful number, since it uses less digits than its factorization.

640006226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768156.

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

The square root of 640006226 is about 25298.3443331772. The cubic root of 640006226 is about 861.7766704850.

The spelling of 640006226 in words is "six hundred forty million, six thousand, two hundred twenty-six".