628555 has 4 divisors (see below), whose sum is σ = 754272. Its totient is φ = 502840.

The previous prime is 628547. The next prime is 628561. The reversal of 628555 is 555826.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 628555 - 2³ = 628547 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 62851 + ... + 62860.

It is an arithmetic number, because the mean of its divisors is an integer number (188568).

2⁶²⁸⁵⁵⁵ is an apocalyptic number.

628555 is a deficient number, since it is larger than the sum of its proper divisors (125717).

628555 is a wasteful number, since it uses less digits than its factorization.

628555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125716.

The product of its digits is 12000, while the sum is 31.

The square root of 628555 is about 792.8146063236. The cubic root of 628555 is about 85.6605966687.

It can be divided in two parts, 6 and 28555, that added together give a 4-th power (28561 = 13⁴).

The spelling of 628555 in words is "six hundred twenty-eight thousand, five hundred fifty-five".