628406 has 16 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 284328.

The previous prime is 628399. The next prime is 628423. The reversal of 628406 is 604826.

It is a Curzon number.

It is a congruent number.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 515 + ... + 1233.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2⁶²⁸⁴⁰⁶ is an apocalyptic number.

628406 is a deficient number, since it is larger than the sum of its proper divisors (408394).

628406 is a wasteful number, since it uses less digits than its factorization.

628406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 628406 is about 792.7206317487. The cubic root of 628406 is about 85.6538274719.

The spelling of 628406 in words is "six hundred twenty-eight thousand, four hundred six".