628751891975989 has 2 divisors, whose sum is σ = 628751891975990. Its totient is φ = 628751891975988.

The previous prime is 628751891975939. The next prime is 628751891976037. The reversal of 628751891975989 is 989579198157826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521823573397764 + 106928318578225 = 22843458^2 + 10340615^2 .

It is a cyclic number.

It is not a de Polignac number, because 628751891975989 - 2⁷ = 628751891975861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 628751891975897 and 628751891975906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628751891975939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314375945987994 + 314375945987995.

It is an arithmetic number, because the mean of its divisors is an integer number (314375945987995).

Almost surely, 2^{628751891975989} is an apocalyptic number.

It is an amenable number.

628751891975989 is a deficient number, since it is larger than the sum of its proper divisors (1).

628751891975989 is an equidigital number, since it uses as much as digits as its factorization.

628751891975989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49380710400, while the sum is 94.

The spelling of 628751891975989 in words is "six hundred twenty-eight trillion, seven hundred fifty-one billion, eight hundred ninety-one million, nine hundred seventy-five thousand, nine hundred eighty-nine".