628865928 has 48 divisors (see below), whose sum is σ = 1761914700. Its totient is φ = 202392960.

The previous prime is 628865911. The next prime is 628865929. The reversal of 628865928 is 829568826.

628865928 is a `hidden beast` number, since 628 + 8 + 6 + 5 + 9 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 585543204 + 43322724 = 24198^2 + 6582^2 .

It is not an unprimeable number, because it can be changed into a prime (628865929) 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 11 ways as a sum of consecutive naturals, for example, 148503 + ... + 152678.

Almost surely, 2^628865928 is an apocalyptic number.

It is an amenable number.

628865928 is an abundant number, since it is smaller than the sum of its proper divisors (1133048772).

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

628865928 is a wasteful number, since it uses less digits than its factorization.

628865928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301222 (or 301215 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 628865928 is about 25077.1993651604. The cubic root of 628865928 is about 856.7471894783.

The spelling of 628865928 in words is "six hundred twenty-eight million, eight hundred sixty-five thousand, nine hundred twenty-eight".