321628 has 6 divisors (see below), whose sum is σ = 562856. Its totient is φ = 160812.

The previous prime is 321619. The next prime is 321631. The reversal of 321628 is 826123.

It is a d-powerful number, because it can be written as 3⁶ + 2 + 6⁷ + 1 + 2¹³ + 8⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 321599 and 321608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40200 + ... + 40207.

2³²¹⁶²⁸ is an apocalyptic number.

It is an amenable number.

321628 is a deficient number, since it is larger than the sum of its proper divisors (241228).

321628 is a wasteful number, since it uses less digits than its factorization.

321628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80411 (or 80409 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 321628 is about 567.1225617095. The cubic root of 321628 is about 68.5148350841.

It can be divided in two parts, 321 and 628, that added together give a palindrome (949).

The spelling of 321628 in words is "three hundred twenty-one thousand, six hundred twenty-eight".