628318 has 4 divisors (see below), whose sum is σ = 942480. Its totient is φ = 314158.

The previous prime is 628301. The next prime is 628319. The reversal of 628318 is 813826.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628319) by changing a digit.

628318 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157078 + ... + 157081.

It is an arithmetic number, because the mean of its divisors is an integer number (235620).

2⁶²⁸³¹⁸ is an apocalyptic number.

628318 is a deficient number, since it is larger than the sum of its proper divisors (314162).

628318 is a wasteful number, since it uses less digits than its factorization.

628318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314161.

The product of its digits is 2304, while the sum is 28.

The square root of 628318 is about 792.6651247532. The cubic root of 628318 is about 85.6498290543.

It can be divided in two parts, 628 and 318, that added together give a triangular number (946 = T₄₃).

The spelling of 628318 in words is "six hundred twenty-eight thousand, three hundred eighteen".