628958438761 has 3 divisors (see below), whose sum is σ = 628959231831. Its totient is φ = 628957645692.

The previous prime is 628958438707. The next prime is 628958438777. The reversal of 628958438761 is 167834859826.

The square root of 628958438761 is 793069.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 25322675161 + 603635763600 = 159131^2 + 776940^2 .

It is not a de Polignac number, because 628958438761 - 2¹¹ = 628958436713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628958438161) 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 2 ways as a sum of consecutive naturals, for example, 396535 + ... + 1189603.

It is an arithmetic number, because the mean of its divisors is an integer number (209653077277).

Almost surely, 2^628958438761 is an apocalyptic number.

628958438761 is the 793069-th square number.

628958438761 is the 396535-th centered octagonal number.

It is an amenable number.

628958438761 is a deficient number, since it is larger than the sum of its proper divisors (793070).

628958438761 is an frugal number, since it uses more digits than its factorization.

628958438761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586138 (or 793069 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 67.

The spelling of 628958438761 in words is "six hundred twenty-eight billion, nine hundred fifty-eight million, four hundred thirty-eight thousand, seven hundred sixty-one".