420628 has 12 divisors (see below), whose sum is σ = 792820. Its totient is φ = 194112.

The previous prime is 420613. The next prime is 420671. The reversal of 420628 is 826024.

It can be written as a sum of positive squares in 2 ways, for example, as 26244 + 394384 = 162^2 + 628^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 420599 and 420608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3993 + ... + 4096.

2⁴²⁰⁶²⁸ is an apocalyptic number.

It is an amenable number.

420628 is a deficient number, since it is larger than the sum of its proper divisors (372192).

420628 is a wasteful number, since it uses less digits than its factorization.

420628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106 (or 8104 counting only the distinct ones).

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

The square root of 420628 is about 648.5584013796. The cubic root of 420628 is about 74.9260307751.

The spelling of 420628 in words is "four hundred twenty thousand, six hundred twenty-eight".