628557 has 4 divisors (see below), whose sum is σ = 838080. Its totient is φ = 419036.

The previous prime is 628547. The next prime is 628561. The reversal of 628557 is 755826.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 628557 - 2⁶ = 628493 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628547) by changing a digit.

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, 104757 + ... + 104762.

It is an arithmetic number, because the mean of its divisors is an integer number (209520).

2⁶²⁸⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

628557 is a deficient number, since it is larger than the sum of its proper divisors (209523).

628557 is a wasteful number, since it uses less digits than its factorization.

628557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209522.

The product of its digits is 16800, while the sum is 33.

The square root of 628557 is about 792.8158676515. The cubic root of 628557 is about 85.6606875231.

The spelling of 628557 in words is "six hundred twenty-eight thousand, five hundred fifty-seven".