628558 has 32 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 238464.

The previous prime is 628547. The next prime is 628561. The reversal of 628558 is 855826.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

628558 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 in 15 ways as a sum of consecutive naturals, for example, 4453 + ... + 4591.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶²⁸⁵⁵⁸ is an apocalyptic number.

628558 is a deficient number, since it is larger than the sum of its proper divisors (581042).

628558 is a wasteful number, since it uses less digits than its factorization.

628558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184.

The product of its digits is 19200, while the sum is 34.

The square root of 628558 is about 792.8164983147. The cubic root of 628558 is about 85.6607329503.

The spelling of 628558 in words is "six hundred twenty-eight thousand, five hundred fifty-eight".