627661 has 2 divisors, whose sum is σ = 627662. Its totient is φ = 627660.

The previous prime is 627659. The next prime is 627667. The reversal of 627661 is 166726.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 42436 = 765^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 627661 - 2¹ = 627659 is a prime.

Together with 627659, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (627667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313830 + 313831.

It is an arithmetic number, because the mean of its divisors is an integer number (313831).

2⁶²⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

627661 is a deficient number, since it is larger than the sum of its proper divisors (1).

627661 is an equidigital number, since it uses as much as digits as its factorization.

627661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 627661 is about 792.2505916691. The cubic root of 627661 is about 85.6199654276.

The spelling of 627661 in words is "six hundred twenty-seven thousand, six hundred sixty-one".