628669 has 4 divisors (see below), whose sum is σ = 633600. Its totient is φ = 623740.

The previous prime is 628651. The next prime is 628673. The reversal of 628669 is 966826.

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 628669 - 2¹¹ = 626621 is a prime.

It is a super-2 number, since 2×628669² = 790449423122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2269 + ... + 2530.

It is an arithmetic number, because the mean of its divisors is an integer number (158400).

2⁶²⁸⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

628669 is a deficient number, since it is larger than the sum of its proper divisors (4931).

628669 is a wasteful number, since it uses less digits than its factorization.

628669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930.

The product of its digits is 31104, while the sum is 37.

The square root of 628669 is about 792.8864988130. The cubic root of 628669 is about 85.6657750634.

The spelling of 628669 in words is "six hundred twenty-eight thousand, six hundred sixty-nine".