628789055 has 4 divisors (see below), whose sum is σ = 754546872. Its totient is φ = 503031240.

The previous prime is 628789033. The next prime is 628789061. The reversal of 628789055 is 550987826.

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

It is not a de Polignac number, because 628789055 - 2¹⁶ = 628723519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628788994 and 628789012.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 62878901 + ... + 62878910.

It is an arithmetic number, because the mean of its divisors is an integer number (188636718).

Almost surely, 2^628789055 is an apocalyptic number.

628789055 is a deficient number, since it is larger than the sum of its proper divisors (125757817).

628789055 is a wasteful number, since it uses less digits than its factorization.

628789055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125757816.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The square root of 628789055 is about 25075.6665913391. Note that the first 3 decimals coincide. The cubic root of 628789055 is about 856.7122782688.

The spelling of 628789055 in words is "six hundred twenty-eight million, seven hundred eighty-nine thousand, fifty-five".