626944639 has 2 divisors, whose sum is σ = 626944640. Its totient is φ = 626944638.

The previous prime is 626944631. The next prime is 626944663. The reversal of 626944639 is 936449626.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 626944639 - 2³ = 626944631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 626944592 and 626944601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626944631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313472319 + 313472320.

It is an arithmetic number, because the mean of its divisors is an integer number (313472320).

Almost surely, 2^626944639 is an apocalyptic number.

626944639 is a deficient number, since it is larger than the sum of its proper divisors (1).

626944639 is an equidigital number, since it uses as much as digits as its factorization.

626944639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 49.

The square root of 626944639 is about 25038.8625740068. The cubic root of 626944639 is about 855.8737981582.

The spelling of 626944639 in words is "six hundred twenty-six million, nine hundred forty-four thousand, six hundred thirty-nine".