628679 has 2 divisors, whose sum is σ = 628680. Its totient is φ = 628678.

The previous prime is 628673. The next prime is 628681. The reversal of 628679 is 976826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628679 - 2⁸ = 628423 is a prime.

It is a Sophie Germain prime.

Together with 628681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628673) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314339 + 314340.

It is an arithmetic number, because the mean of its divisors is an integer number (314340).

2⁶²⁸⁶⁷⁹ is an apocalyptic number.

628679 is a deficient number, since it is larger than the sum of its proper divisors (1).

628679 is an equidigital number, since it uses as much as digits as its factorization.

628679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 628679 is about 792.8928048608. The cubic root of 628679 is about 85.6662292787. Note that the first 3 decimals are identical.

The spelling of 628679 in words is "six hundred twenty-eight thousand, six hundred seventy-nine".