628733257 has 2 divisors, whose sum is σ = 628733258. Its totient is φ = 628733256.

The previous prime is 628733233. The next prime is 628733263. The reversal of 628733257 is 752337826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624050361 + 4682896 = 24981^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 628733257 - 2¹⁹ = 628208969 is a prime.

It is not a weakly prime, because it can be changed into another prime (628733207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314366628 + 314366629.

It is an arithmetic number, because the mean of its divisors is an integer number (314366629).

Almost surely, 2^628733257 is an apocalyptic number.

It is an amenable number.

628733257 is a deficient number, since it is larger than the sum of its proper divisors (1).

628733257 is an equidigital number, since it uses as much as digits as its factorization.

628733257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 43.

The square root of 628733257 is about 25074.5539740989. The cubic root of 628733257 is about 856.6869363064.

The spelling of 628733257 in words is "six hundred twenty-eight million, seven hundred thirty-three thousand, two hundred fifty-seven".