626640613 has 16 divisors (see below), whose sum is σ = 666247680. Its totient is φ = 588399616.

The previous prime is 626640607. The next prime is 626640647. The reversal of 626640613 is 316046626.

It is a cyclic number.

It is not a de Polignac number, because 626640613 - 2⁹ = 626640101 is a prime.

It is a super-2 number, since 2×626640613² = 785356915722031538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626640683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226245 + ... + 228997.

It is an arithmetic number, because the mean of its divisors is an integer number (41640480).

Almost surely, 2^626640613 is an apocalyptic number.

It is an amenable number.

626640613 is a deficient number, since it is larger than the sum of its proper divisors (39607067).

626640613 is a wasteful number, since it uses less digits than its factorization.

626640613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 626640613 is about 25032.7907553273. The cubic root of 626640613 is about 855.7354287054.

The spelling of 626640613 in words is "six hundred twenty-six million, six hundred forty thousand, six hundred thirteen".