628394871 has 16 divisors (see below), whose sum is σ = 919338336. Its totient is φ = 379406976.

The previous prime is 628394867. The next prime is 628394873. The reversal of 628394871 is 178493826.

It is not a de Polignac number, because 628394871 - 2² = 628394867 is a prime.

It is a super-2 number, since 2×628394871² = 789760227798213282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 628394871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628394873) 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 15 ways as a sum of consecutive naturals, for example, 149940 + ... + 154073.

It is an arithmetic number, because the mean of its divisors is an integer number (57458646).

Almost surely, 2^628394871 is an apocalyptic number.

628394871 is a deficient number, since it is larger than the sum of its proper divisors (290943465).

628394871 is a wasteful number, since it uses less digits than its factorization.

628394871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304082.

The product of its digits is 580608, while the sum is 48.

The square root of 628394871 is about 25067.8054683692. The cubic root of 628394871 is about 856.5332182897.

The spelling of 628394871 in words is "six hundred twenty-eight million, three hundred ninety-four thousand, eight hundred seventy-one".