628666469 has 2 divisors, whose sum is σ = 628666470. Its totient is φ = 628666468.

The previous prime is 628666459. The next prime is 628666481. The reversal of 628666469 is 964666826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620657569 + 8008900 = 24913^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 628666469 - 2¹² = 628662373 is a prime.

It is a super-2 number, since 2×628666469² = 790443058489855922, which contains 22 as substring.

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 628666469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628666439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314333234 + 314333235.

It is an arithmetic number, because the mean of its divisors is an integer number (314333235).

Almost surely, 2^628666469 is an apocalyptic number.

It is an amenable number.

628666469 is a deficient number, since it is larger than the sum of its proper divisors (1).

628666469 is an equidigital number, since it uses as much as digits as its factorization.

628666469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 53.

The square root of 628666469 is about 25073.2221503340. Note that the first 3 decimals coincide. The cubic root of 628666469 is about 856.6566010078.

The spelling of 628666469 in words is "six hundred twenty-eight million, six hundred sixty-six thousand, four hundred sixty-nine".