628556553 has 6 divisors (see below), whose sum is σ = 907915034. Its totient is φ = 419037696.

The previous prime is 628556549. The next prime is 628556563. The reversal of 628556553 is 355655826.

628556553 is a `hidden beast` number, since 6 + 2 + 85 + 565 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 618367689 + 10188864 = 24867^2 + 3192^2 .

It is not a de Polignac number, because 628556553 - 2² = 628556549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 628556499 and 628556508.

It is not an unprimeable number, because it can be changed into a prime (628556503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34919800 + ... + 34919817.

Almost surely, 2^628556553 is an apocalyptic number.

It is an amenable number.

628556553 is a deficient number, since it is larger than the sum of its proper divisors (279358481).

628556553 is a wasteful number, since it uses less digits than its factorization.

628556553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69839623 (or 69839620 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The square root of 628556553 is about 25071.0301543435. The cubic root of 628556553 is about 856.6066721718.

The spelling of 628556553 in words is "six hundred twenty-eight million, five hundred fifty-six thousand, five hundred fifty-three".