621344220 has 144 divisors (see below), whose sum is σ = 2112552960. Its totient is φ = 133641216.

The previous prime is 621344209. The next prime is 621344233. The reversal of 621344220 is 22443126.

621344220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118821 + ... + 123939.

Almost surely, 2^621344220 is an apocalyptic number.

621344220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621344220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056276480).

621344220 is an abundant number, since it is smaller than the sum of its proper divisors (1491208740).

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

621344220 is a wasteful number, since it uses less digits than its factorization.

621344220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172 (or 5153 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 621344220 is about 24926.7771683385. Note that the first 3 decimals coincide. The cubic root of 621344220 is about 853.3177002480.

Adding to 621344220 its reverse (22443126), we get a palindrome (643787346).

The spelling of 621344220 in words is "six hundred twenty-one million, three hundred forty-four thousand, two hundred twenty".