628566723684 has 27 divisors (see below), whose sum is σ = 1588889020537. Its totient is φ = 209520655584.

The previous prime is 628566723649. The next prime is 628566723691. The reversal of 628566723684 is 486327665826.

It is a happy number.

The square root of 628566723684 is 792822.

It is a perfect power (a square), and thus also a powerful number.

628566723684 is a `hidden beast` number, since 6 + 2 + 8 + 566 + 7 + 2 + 3 + 68 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 66858444900 + 561708278784 = 258570^2 + 749472^2 .

It is a super-2 number, since 2×628566723684² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4690864 + ... + 4823000.

Almost surely, 2^628566723684 is an apocalyptic number.

628566723684 is the 792822-nd square number.

It is an amenable number.

628566723684 is an abundant number, since it is smaller than the sum of its proper divisors (960322296853).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628566723684 is an frugal number, since it uses more digits than its factorization.

628566723684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264284 (or 132142 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 63.

The spelling of 628566723684 in words is "six hundred twenty-eight billion, five hundred sixty-six million, seven hundred twenty-three thousand, six hundred eighty-four".