628511671 has 2 divisors, whose sum is σ = 628511672. Its totient is φ = 628511670.

The previous prime is 628511629. The next prime is 628511717. The reversal of 628511671 is 176115826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628511671 - 2⁹ = 628511159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628511671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628512671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314255835 + 314255836.

It is an arithmetic number, because the mean of its divisors is an integer number (314255836).

Almost surely, 2^628511671 is an apocalyptic number.

628511671 is a deficient number, since it is larger than the sum of its proper divisors (1).

628511671 is an equidigital number, since it uses as much as digits as its factorization.

628511671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 628511671 is about 25070.1350415190. The cubic root of 628511671 is about 856.5862830567.

It can be divided in two parts, 6285 and 11671, that added together give a square (17956 = 134²).

The spelling of 628511671 in words is "six hundred twenty-eight million, five hundred eleven thousand, six hundred seventy-one".