628669794769 has 9 divisors (see below), whose sum is σ = 649629047451. Its totient is φ = 608366337360.

The previous prime is 628669794631. The next prime is 628669794793. The reversal of 628669794769 is 967497966826.

The square root of 628669794769 is 792887.

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

It can be written as a sum of positive squares in only one way, i.e., 25736180625 + 602933614144 = 160425^2 + 776488^2 .

It is not a de Polignac number, because 628669794769 - 2²³ = 628661406161 is a prime.

It is a super-2 number, since 2×628669794769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628669794799) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24566709 + ... + 24592285.

Almost surely, 2^628669794769 is an apocalyptic number.

628669794769 is the 792887-th square number.

628669794769 is the 396444-th centered octagonal number.

It is an amenable number.

628669794769 is a deficient number, since it is larger than the sum of its proper divisors (20959252682).

628669794769 is an frugal number, since it uses more digits than its factorization.

628669794769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51216 (or 25608 counting only the distinct ones).

The product of its digits is 2962842624, while the sum is 79.

The spelling of 628669794769 in words is "six hundred twenty-eight billion, six hundred sixty-nine million, seven hundred ninety-four thousand, seven hundred sixty-nine".