621320 has 48 divisors (see below), whose sum is σ = 1631340. Its totient is φ = 212352.

The previous prime is 621317. The next prime is 621337. The reversal of 621320 is 23126.

It can be written as a sum of positive squares in 2 ways, for example, as 550564 + 70756 = 742^2 + 266^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 621295 and 621304.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621320.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1802 + ... + 2118.

2⁶²¹³²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815670).

621320 is an abundant number, since it is smaller than the sum of its proper divisors (1010020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621320 is a wasteful number, since it uses less digits than its factorization.

621320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 621320 is about 788.2385425745. The cubic root of 621320 is about 85.3306612662.

Adding to 621320 its reverse (23126), we get a palindrome (644446).

The spelling of 621320 in words is "six hundred twenty-one thousand, three hundred twenty".