627721 has 2 divisors, whose sum is σ = 627722. Its totient is φ = 627720.

The previous prime is 627709. The next prime is 627733. The reversal of 627721 is 127726.

It is a balanced prime because it is at equal distance from previous prime (627709) and next prime (627733).

It can be written as a sum of positive squares in only one way, i.e., 608400 + 19321 = 780^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 627721 - 2⁷ = 627593 is a prime.

627721 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (627791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313860 + 313861.

It is an arithmetic number, because the mean of its divisors is an integer number (313861).

2⁶²⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

627721 is a deficient number, since it is larger than the sum of its proper divisors (1).

627721 is an equidigital number, since it uses as much as digits as its factorization.

627721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 25.

The square root of 627721 is about 792.2884575709. The cubic root of 627721 is about 85.6226935639.

The spelling of 627721 in words is "six hundred twenty-seven thousand, seven hundred twenty-one".