628917 has 4 divisors (see below), whose sum is σ = 838560. Its totient is φ = 419276.

The previous prime is 628913. The next prime is 628921. The reversal of 628917 is 719826.

628917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (628913) and next prime (628921).

It is a cyclic number.

It is not a de Polignac number, because 628917 - 2² = 628913 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 (628913) 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, 104817 + ... + 104822.

It is an arithmetic number, because the mean of its divisors is an integer number (209640).

2⁶²⁸⁹¹⁷ is an apocalyptic number.

It is an amenable number.

628917 is a deficient number, since it is larger than the sum of its proper divisors (209643).

628917 is a wasteful number, since it uses less digits than its factorization.

628917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209642.

The product of its digits is 6048, while the sum is 33.

The square root of 628917 is about 793.0428739986. The cubic root of 628917 is about 85.6770381813.

Subtracting 628917 from its reverse (719826), we obtain a palindrome (90909).

The spelling of 628917 in words is "six hundred twenty-eight thousand, nine hundred seventeen".