626740645 has 4 divisors (see below), whose sum is σ = 752088780. Its totient is φ = 501392512.

The previous prime is 626740633. The next prime is 626740651. The reversal of 626740645 is 546047626.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403447396 + 223293249 = 20086^2 + 14943^2 .

It is a cyclic number.

It is not a de Polignac number, because 626740645 - 2¹³ = 626732453 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 626740598 and 626740607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62674060 + ... + 62674069.

It is an arithmetic number, because the mean of its divisors is an integer number (188022195).

Almost surely, 2^626740645 is an apocalyptic number.

It is an amenable number.

626740645 is a deficient number, since it is larger than the sum of its proper divisors (125348135).

626740645 is a wasteful number, since it uses less digits than its factorization.

626740645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125348134.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 626740645 is about 25034.7886949341. The cubic root of 626740645 is about 855.7809605835.

The spelling of 626740645 in words is "six hundred twenty-six million, seven hundred forty thousand, six hundred forty-five".