640224626 has 8 divisors (see below), whose sum is σ = 961291740. Its totient is φ = 319794048.

The previous prime is 640224593. The next prime is 640224661. The reversal of 640224626 is 626422046.

It can be written as a sum of positive squares in 2 ways, for example, as 610139401 + 30085225 = 24701^2 + 5485^2 .

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 = 640224592 and 640224601.

It is an unprimeable number.

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, 156611 + ... + 160646.

Almost surely, 2^640224626 is an apocalyptic number.

640224626 is a deficient number, since it is larger than the sum of its proper divisors (321067114).

640224626 is a wasteful number, since it uses less digits than its factorization.

640224626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318268.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 640224626 is about 25302.6604530038. The cubic root of 640224626 is about 861.8746854794.

The spelling of 640224626 in words is "six hundred forty million, two hundred twenty-four thousand, six hundred twenty-six".