628701380891 has 2 divisors, whose sum is σ = 628701380892. Its totient is φ = 628701380890.

The previous prime is 628701380719. The next prime is 628701380947. The reversal of 628701380891 is 198083107826.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628701380891 is a prime.

It is not a weakly prime, because it can be changed into another prime (628701380591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314350690445 + 314350690446.

It is an arithmetic number, because the mean of its divisors is an integer number (314350690446).

Almost surely, 2^628701380891 is an apocalyptic number.

628701380891 is a deficient number, since it is larger than the sum of its proper divisors (1).

628701380891 is an equidigital number, since it uses as much as digits as its factorization.

628701380891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The spelling of 628701380891 in words is "six hundred twenty-eight billion, seven hundred one million, three hundred eighty thousand, eight hundred ninety-one".