628420 has 24 divisors (see below), whose sum is σ = 1421784. Its totient is φ = 231936.

The previous prime is 628399. The next prime is 628423. The reversal of 628420 is 24826.

It can be written as a sum of positive squares in 4 ways, for example, as 112896 + 515524 = 336^2 + 718^2 .

It is a junction number, because it is equal to n+sod(n) for n = 628391 and 628400.

It is not an unprimeable number, because it can be changed into a prime (628423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (59241).

2⁶²⁸⁴²⁰ is an apocalyptic number.

It is an amenable number.

628420 is an abundant number, since it is smaller than the sum of its proper divisors (793364).

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

628420 is a wasteful number, since it uses less digits than its factorization.

628420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439 (or 2437 counting only the distinct ones).

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

The square root of 628420 is about 792.7294620487. The cubic root of 628420 is about 85.6544635493.

The spelling of 628420 in words is "six hundred twenty-eight thousand, four hundred twenty".