626740643 has 8 divisors (see below), whose sum is σ = 637424640. Its totient is φ = 616108360.

The previous prime is 626740633. The next prime is 626740651. The reversal of 626740643 is 346047626.

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

It is a cyclic number.

It is not a de Polignac number, because 626740643 - 2¹⁶ = 626675107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 626740597 and 626740606.

It is not an unprimeable number, because it can be changed into a prime (626740633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11918 + ... + 37356.

It is an arithmetic number, because the mean of its divisors is an integer number (79678080).

Almost surely, 2^626740643 is an apocalyptic number.

626740643 is a deficient number, since it is larger than the sum of its proper divisors (10683997).

626740643 is a wasteful number, since it uses less digits than its factorization.

626740643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25857.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 626740643 is about 25034.7886549897. The cubic root of 626740643 is about 855.7809596732.

The spelling of 626740643 in words is "six hundred twenty-six million, seven hundred forty thousand, six hundred forty-three".