628982257 has 2 divisors, whose sum is σ = 628982258. Its totient is φ = 628982256.

The previous prime is 628982243. The next prime is 628982309. The reversal of 628982257 is 752289826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458131216 + 170851041 = 21404^2 + 13071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628982257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628982257.

It is not a weakly prime, because it can be changed into another prime (628982227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314491128 + 314491129.

It is an arithmetic number, because the mean of its divisors is an integer number (314491129).

Almost surely, 2^628982257 is an apocalyptic number.

It is an amenable number.

628982257 is a deficient number, since it is larger than the sum of its proper divisors (1).

628982257 is an equidigital number, since it uses as much as digits as its factorization.

628982257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 628982257 is about 25079.5186756046. The cubic root of 628982257 is about 856.8000138799.

The spelling of 628982257 in words is "six hundred twenty-eight million, nine hundred eighty-two thousand, two hundred fifty-seven".