628240 has 20 divisors (see below), whose sum is σ = 1460844. Its totient is φ = 251264.

The previous prime is 628231. The next prime is 628261. The reversal of 628240 is 42826.

It can be written as a sum of positive squares in 2 ways, for example, as 92416 + 535824 = 304^2 + 732^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 3847 + ... + 4006.

2⁶²⁸²⁴⁰ is an apocalyptic number.

It is an amenable number.

628240 is an abundant number, since it is smaller than the sum of its proper divisors (832604).

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

628240 is a wasteful number, since it uses less digits than its factorization.

628240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866 (or 7860 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 628240 is about 792.6159221212. The cubic root of 628240 is about 85.6462846903.

It can be divided in two parts, 628 and 240, that added together give a palindrome (868).

The spelling of 628240 in words is "six hundred twenty-eight thousand, two hundred forty".