628728719581 has 2 divisors, whose sum is σ = 628728719582. Its totient is φ = 628728719580.

The previous prime is 628728719543. The next prime is 628728719603. The reversal of 628728719581 is 185917827826.

628728719581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472360671225 + 156368048356 = 687285^2 + 395434^2 .

It is a cyclic number.

It is not a de Polignac number, because 628728719581 - 2⁷ = 628728719453 is a prime.

It is a super-2 number, since 2×628728719581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628728719881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314364359790 + 314364359791.

It is an arithmetic number, because the mean of its divisors is an integer number (314364359791).

Almost surely, 2^628728719581 is an apocalyptic number.

It is an amenable number.

628728719581 is a deficient number, since it is larger than the sum of its proper divisors (1).

628728719581 is an equidigital number, since it uses as much as digits as its factorization.

628728719581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27095040, while the sum is 64.

The spelling of 628728719581 in words is "six hundred twenty-eight billion, seven hundred twenty-eight million, seven hundred nineteen thousand, five hundred eighty-one".