628261 has 2 divisors, whose sum is σ = 628262. Its totient is φ = 628260.

The previous prime is 628231. The next prime is 628267. The reversal of 628261 is 162826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 231361 = 630^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 628261 - 2⁹ = 627749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314130 + 314131.

It is an arithmetic number, because the mean of its divisors is an integer number (314131).

2⁶²⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

628261 is a deficient number, since it is larger than the sum of its proper divisors (1).

628261 is an equidigital number, since it uses as much as digits as its factorization.

628261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 628261 is about 792.6291692841. The cubic root of 628261 is about 85.6472389710.

The spelling of 628261 in words is "six hundred twenty-eight thousand, two hundred sixty-one".