621328 has 10 divisors (see below), whose sum is σ = 1203854. Its totient is φ = 310656.

The previous prime is 621317. The next prime is 621337. The reversal of 621328 is 823126.

It can be written as a sum of positive squares in only one way, i.e., 451584 + 169744 = 672^2 + 412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 621299 and 621308.

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, 19401 + ... + 19432.

2⁶²¹³²⁸ is an apocalyptic number.

It is an amenable number.

621328 is a deficient number, since it is larger than the sum of its proper divisors (582526).

621328 is a wasteful number, since it uses less digits than its factorization.

621328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38841 (or 38835 counting only the distinct ones).

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

The square root of 621328 is about 788.2436171641. The cubic root of 621328 is about 85.3310274985.

It can be divided in two parts, 6213 and 28, that added together give a square (6241 = 79²).

The spelling of 621328 in words is "six hundred twenty-one thousand, three hundred twenty-eight".