628559 has 4 divisors (see below), whose sum is σ = 636216. Its totient is φ = 620904.

The previous prime is 628547. The next prime is 628561. The reversal of 628559 is 955826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955826 = 2 ⋅477913.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3704 + ... + 3869.

It is an arithmetic number, because the mean of its divisors is an integer number (159054).

2⁶²⁸⁵⁵⁹ is an apocalyptic number.

628559 is a deficient number, since it is larger than the sum of its proper divisors (7657).

628559 is an equidigital number, since it uses as much as digits as its factorization.

628559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7656.

The product of its digits is 21600, while the sum is 35.

The square root of 628559 is about 792.8171289774. The cubic root of 628559 is about 85.6607783774.

The spelling of 628559 in words is "six hundred twenty-eight thousand, five hundred fifty-nine".