628642529 has 2 divisors, whose sum is σ = 628642530. Its totient is φ = 628642528.

The previous prime is 628642523. The next prime is 628642537. The reversal of 628642529 is 925246826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338008225 + 290634304 = 18385^2 + 17048^2 .

It is a cyclic number.

It is not a de Polignac number, because 628642529 - 2¹² = 628638433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628642529.

It is not a weakly prime, because it can be changed into another prime (628642523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314321264 + 314321265.

It is an arithmetic number, because the mean of its divisors is an integer number (314321265).

Almost surely, 2^628642529 is an apocalyptic number.

It is an amenable number.

628642529 is a deficient number, since it is larger than the sum of its proper divisors (1).

628642529 is an equidigital number, since it uses as much as digits as its factorization.

628642529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 44.

The square root of 628642529 is about 25072.7447440443. The cubic root of 628642529 is about 856.6457268690.

The spelling of 628642529 in words is "six hundred twenty-eight million, six hundred forty-two thousand, five hundred twenty-nine".