628798517 has 2 divisors, whose sum is σ = 628798518. Its totient is φ = 628798516.

The previous prime is 628798481. The next prime is 628798531. The reversal of 628798517 is 715897826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 465955396 + 162843121 = 21586^2 + 12761^2 .

It is a cyclic number.

It is not a de Polignac number, because 628798517 - 2¹⁰ = 628797493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628791517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314399258 + 314399259.

It is an arithmetic number, because the mean of its divisors is an integer number (314399259).

Almost surely, 2^628798517 is an apocalyptic number.

It is an amenable number.

628798517 is a deficient number, since it is larger than the sum of its proper divisors (1).

628798517 is an equidigital number, since it uses as much as digits as its factorization.

628798517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The square root of 628798517 is about 25075.8552595918. The cubic root of 628798517 is about 856.7165755080.

The spelling of 628798517 in words is "six hundred twenty-eight million, seven hundred ninety-eight thousand, five hundred seventeen".