628628069 has 2 divisors, whose sum is σ = 628628070. Its totient is φ = 628628068.

The previous prime is 628628047. The next prime is 628628087. The reversal of 628628069 is 960826826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578402500 + 50225569 = 24050^2 + 7087^2 .

It is a cyclic number.

It is not a de Polignac number, because 628628069 - 2¹⁶ = 628562533 is a prime.

It is a super-2 number, since 2×628628069² = 790346498269337522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628628569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314314034 + 314314035.

It is an arithmetic number, because the mean of its divisors is an integer number (314314035).

Almost surely, 2^628628069 is an apocalyptic number.

It is an amenable number.

628628069 is a deficient number, since it is larger than the sum of its proper divisors (1).

628628069 is an equidigital number, since it uses as much as digits as its factorization.

628628069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 628628069 is about 25072.4563814557. The cubic root of 628628069 is about 856.6391586464.

The spelling of 628628069 in words is "six hundred twenty-eight million, six hundred twenty-eight thousand, sixty-nine".