628402671709 has 2 divisors, whose sum is σ = 628402671710. Its totient is φ = 628402671708.

The previous prime is 628402671707. The next prime is 628402671769. The reversal of 628402671709 is 907176204826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 625715804484 + 2686867225 = 791022^2 + 51835^2 .

It is a cyclic number.

It is not a de Polignac number, because 628402671709 - 2¹ = 628402671707 is a prime.

It is a super-2 number, since 2×628402671709² (a number of 24 digits) contains 22 as substring.

Together with 628402671707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628402671707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314201335854 + 314201335855.

It is an arithmetic number, because the mean of its divisors is an integer number (314201335855).

Almost surely, 2^628402671709 is an apocalyptic number.

It is an amenable number.

628402671709 is a deficient number, since it is larger than the sum of its proper divisors (1).

628402671709 is an equidigital number, since it uses as much as digits as its factorization.

628402671709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 628402671709 in words is "six hundred twenty-eight billion, four hundred two million, six hundred seventy-one thousand, seven hundred nine".