628817 has 12 divisors (see below), whose sum is σ = 751716. Its totient is φ = 524160.

The previous prime is 628811. The next prime is 628819. The reversal of 628817 is 718826.

It can be written as a sum of positive squares in 2 ways, for example, as 14161 + 614656 = 119^2 + 784^2 .

It is not a de Polignac number, because 628817 - 2⁴ = 628801 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1853 + ... + 2165.

It is an arithmetic number, because the mean of its divisors is an integer number (62643).

2⁶²⁸⁸¹⁷ is an apocalyptic number.

It is an amenable number.

628817 is a deficient number, since it is larger than the sum of its proper divisors (122899).

628817 is a wasteful number, since it uses less digits than its factorization.

628817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 361 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 628817 is about 792.9798231985. The cubic root of 628817 is about 85.6724969579.

Adding to 628817 its sum of digits (32), we get a square (628849 = 793²).

Subtracting 628817 from its reverse (718826), we obtain a palindrome (90009).

The spelling of 628817 in words is "six hundred twenty-eight thousand, eight hundred seventeen".