628425997 has 2 divisors, whose sum is σ = 628425998. Its totient is φ = 628425996.

The previous prime is 628425979. The next prime is 628426003. The reversal of 628425997 is 799524826.

Together with previous prime (628425979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625700196 + 2725801 = 25014^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 628425997 - 2⁷ = 628425869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628425977) 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, 314212998 + 314212999.

It is an arithmetic number, because the mean of its divisors is an integer number (314212999).

Almost surely, 2^628425997 is an apocalyptic number.

It is an amenable number.

628425997 is a deficient number, since it is larger than the sum of its proper divisors (1).

628425997 is an equidigital number, since it uses as much as digits as its factorization.

628425997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 628425997 is about 25068.4262968380. The cubic root of 628425997 is about 856.5473601475.

The spelling of 628425997 in words is "six hundred twenty-eight million, four hundred twenty-five thousand, nine hundred ninety-seven".