621020304 has 80 divisors (see below), whose sum is σ = 1787732800. Its totient is φ = 206406144.

The previous prime is 621020261. The next prime is 621020311. The reversal of 621020304 is 403020126.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161832 + ... + 165624.

It is an arithmetic number, because the mean of its divisors is an integer number (22346660).

Almost surely, 2^621020304 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 621020304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893866400).

621020304 is an abundant number, since it is smaller than the sum of its proper divisors (1166712496).

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

621020304 is a wasteful number, since it uses less digits than its factorization.

621020304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189 (or 4177 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 621020304 is about 24920.2789711512. The cubic root of 621020304 is about 853.1693920627.

The spelling of 621020304 in words is "six hundred twenty-one million, twenty thousand, three hundred four".