628311982 has 4 divisors (see below), whose sum is σ = 942467976. Its totient is φ = 314155990.

The previous prime is 628311977. The next prime is 628311989. The reversal of 628311982 is 289113826.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628311989) 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 as a sum of consecutive naturals, namely, 157077994 + ... + 157077997.

It is an arithmetic number, because the mean of its divisors is an integer number (235616994).

Almost surely, 2^628311982 is an apocalyptic number.

628311982 is a deficient number, since it is larger than the sum of its proper divisors (314155994).

628311982 is a wasteful number, since it uses less digits than its factorization.

628311982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314155993.

The product of its digits is 41472, while the sum is 40.

The square root of 628311982 is about 25066.1521179458. The cubic root of 628311982 is about 856.4955560346.

The spelling of 628311982 in words is "six hundred twenty-eight million, three hundred eleven thousand, nine hundred eighty-two".