628687511 has 2 divisors, whose sum is σ = 628687512. Its totient is φ = 628687510.

The previous prime is 628687483. The next prime is 628687513. The reversal of 628687511 is 115786826.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628687511 is a prime.

Together with 628687513, 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 (628687513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314343755 + 314343756.

It is an arithmetic number, because the mean of its divisors is an integer number (314343756).

Almost surely, 2^628687511 is an apocalyptic number.

628687511 is a deficient number, since it is larger than the sum of its proper divisors (1).

628687511 is an equidigital number, since it uses as much as digits as its factorization.

628687511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 628687511 is about 25073.6417578301. The cubic root of 628687511 is about 856.6661585756. Note that the first 3 decimals are identical.

The spelling of 628687511 in words is "six hundred twenty-eight million, six hundred eighty-seven thousand, five hundred eleven".