628625993 has 2 divisors, whose sum is σ = 628625994. Its totient is φ = 628625992.

The previous prime is 628625939. The next prime is 628626013. The reversal of 628625993 is 399526826.

Together with previous prime (628625939) 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., 552814144 + 75811849 = 23512^2 + 8707^2 .

It is a cyclic number.

It is not a de Polignac number, because 628625993 - 2⁶ = 628625929 is a prime.

It is not a weakly prime, because it can be changed into another prime (628624993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314312996 + 314312997.

It is an arithmetic number, because the mean of its divisors is an integer number (314312997).

Almost surely, 2^628625993 is an apocalyptic number.

It is an amenable number.

628625993 is a deficient number, since it is larger than the sum of its proper divisors (1).

628625993 is an equidigital number, since it uses as much as digits as its factorization.

628625993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 628625993 is about 25072.4149814093. The cubic root of 628625993 is about 856.6382156485.

The spelling of 628625993 in words is "six hundred twenty-eight million, six hundred twenty-five thousand, nine hundred ninety-three".