628362989 has 2 divisors, whose sum is σ = 628362990. Its totient is φ = 628362988.

The previous prime is 628362979. The next prime is 628363063. The reversal of 628362989 is 989263826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431185225 + 197177764 = 20765^2 + 14042^2 .

It is a cyclic number.

It is not a de Polignac number, because 628362989 - 2⁸ = 628362733 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628362989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628362979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314181494 + 314181495.

It is an arithmetic number, because the mean of its divisors is an integer number (314181495).

Almost surely, 2^628362989 is an apocalyptic number.

It is an amenable number.

628362989 is a deficient number, since it is larger than the sum of its proper divisors (1).

628362989 is an equidigital number, since it uses as much as digits as its factorization.

628362989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 53.

The square root of 628362989 is about 25067.1695450444. The cubic root of 628362989 is about 856.5187324650.

The spelling of 628362989 in words is "six hundred twenty-eight million, three hundred sixty-two thousand, nine hundred eighty-nine".