626944609 has 4 divisors (see below), whose sum is σ = 640283904. Its totient is φ = 613605316.

The previous prime is 626944559. The next prime is 626944631. The reversal of 626944609 is 906449626.

626944609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906449626 = 2 ⋅453224813.

It is a cyclic number.

It is not a de Polignac number, because 626944609 - 2¹⁹ = 626420321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (626944639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6669577 + ... + 6669670.

It is an arithmetic number, because the mean of its divisors is an integer number (160070976).

Almost surely, 2^626944609 is an apocalyptic number.

It is an amenable number.

626944609 is a deficient number, since it is larger than the sum of its proper divisors (13339295).

626944609 is a wasteful number, since it uses less digits than its factorization.

626944609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13339294.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 626944609 is about 25038.8619749381. The cubic root of 626944609 is about 855.8737845067.

The spelling of 626944609 in words is "six hundred twenty-six million, nine hundred forty-four thousand, six hundred nine".