628868 has 6 divisors (see below), whose sum is σ = 1100526. Its totient is φ = 314432.

The previous prime is 628861. The next prime is 628877. The reversal of 628868 is 868826.

It can be written as a sum of positive squares in only one way, i.e., 521284 + 107584 = 722^2 + 328^2 .

It is a super-2 number, since 2×628868² = 790949922848, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (628861) by changing a digit.

628868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78605 + ... + 78612.

It is an arithmetic number, because the mean of its divisors is an integer number (183421).

2⁶²⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

628868 is a deficient number, since it is larger than the sum of its proper divisors (471658).

628868 is a wasteful number, since it uses less digits than its factorization.

628868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157221 (or 157219 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 628868 is about 793.0119797330. The cubic root of 628868 is about 85.6748130420.

The spelling of 628868 in words is "six hundred twenty-eight thousand, eight hundred sixty-eight".