628655497 has 2 divisors, whose sum is σ = 628655498. Its totient is φ = 628655496.

The previous prime is 628655491. The next prime is 628655519. The reversal of 628655497 is 794556826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617224336 + 11431161 = 24844^2 + 3381^2 .

It is a cyclic number.

It is not a de Polignac number, because 628655497 - 2¹⁹ = 628131209 is a prime.

It is not a weakly prime, because it can be changed into another prime (628655491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314327748 + 314327749.

It is an arithmetic number, because the mean of its divisors is an integer number (314327749).

Almost surely, 2^628655497 is an apocalyptic number.

It is an amenable number.

628655497 is a deficient number, since it is larger than the sum of its proper divisors (1).

628655497 is an equidigital number, since it uses as much as digits as its factorization.

628655497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 52.

The square root of 628655497 is about 25073.0033502171. The cubic root of 628655497 is about 856.6516172889.

It can be divided in two parts, 62865 and 5497, that multiplied together give a triangular number (345568905 = T₂₆₂₈₉).

The spelling of 628655497 in words is "six hundred twenty-eight million, six hundred fifty-five thousand, four hundred ninety-seven".