628625939 has 2 divisors, whose sum is σ = 628625940. Its totient is φ = 628625938.

The previous prime is 628625929. The next prime is 628625993. The reversal of 628625939 is 939526826.

Together with next prime (628625993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628625939 - 2¹² = 628621843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628625929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314312969 + 314312970.

It is an arithmetic number, because the mean of its divisors is an integer number (314312970).

Almost surely, 2^628625939 is an apocalyptic number.

628625939 is a deficient number, since it is larger than the sum of its proper divisors (1).

628625939 is an equidigital number, since it uses as much as digits as its factorization.

628625939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 628625939 is about 25072.4139045286. The cubic root of 628625939 is about 856.6381911196.

The spelling of 628625939 in words is "six hundred twenty-eight million, six hundred twenty-five thousand, nine hundred thirty-nine".