628454745 has 24 divisors (see below), whose sum is σ = 1091320776. Its totient is φ = 334560768.

The previous prime is 628454741. The next prime is 628454753. The reversal of 628454745 is 547454826.

628454745 is a `hidden beast` number, since 62 + 8 + 4 + 547 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 501264 + 627953481 = 708^2 + 25059^2 .

It is not a de Polignac number, because 628454745 - 2² = 628454741 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 628454745.

It is not an unprimeable number, because it can be changed into a prime (628454741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12529 + ... + 37601.

It is an arithmetic number, because the mean of its divisors is an integer number (45471699).

Almost surely, 2^628454745 is an apocalyptic number.

It is an amenable number.

628454745 is a deficient number, since it is larger than the sum of its proper divisors (462866031).

628454745 is a wasteful number, since it uses less digits than its factorization.

628454745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25641 (or 25638 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 45.

The square root of 628454745 is about 25068.9996808808. Note that the first 3 decimals coincide. The cubic root of 628454745 is about 856.5604211646.

The spelling of 628454745 in words is "six hundred twenty-eight million, four hundred fifty-four thousand, seven hundred forty-five".