628556545 has 4 divisors (see below), whose sum is σ = 754267860. Its totient is φ = 502845232.

The previous prime is 628556543. The next prime is 628556549. The reversal of 628556545 is 545655826.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103550976 + 525005569 = 10176^2 + 22913^2 .

It is a cyclic number.

It is not a de Polignac number, because 628556545 - 2¹ = 628556543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 628556495 and 628556504.

It is not an unprimeable number, because it can be changed into a prime (628556543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62855650 + ... + 62855659.

It is an arithmetic number, because the mean of its divisors is an integer number (188566965).

Almost surely, 2^628556545 is an apocalyptic number.

It is an amenable number.

628556545 is a deficient number, since it is larger than the sum of its proper divisors (125711315).

628556545 is a wasteful number, since it uses less digits than its factorization.

628556545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125711314.

The product of its digits is 1440000, while the sum is 46.

The square root of 628556545 is about 25071.0299947968. The cubic root of 628556545 is about 856.6066685376.

The spelling of 628556545 in words is "six hundred twenty-eight million, five hundred fifty-six thousand, five hundred forty-five".