621103540 has 48 divisors (see below), whose sum is σ = 1386645120. Its totient is φ = 233020800.

The previous prime is 621103531. The next prime is 621103577. The reversal of 621103540 is 45301126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30289 + ... + 46471.

It is an arithmetic number, because the mean of its divisors is an integer number (28888440).

Almost surely, 2^621103540 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 621103540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693322560).

621103540 is an abundant number, since it is smaller than the sum of its proper divisors (765541580).

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

621103540 is a wasteful number, since it uses less digits than its factorization.

621103540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16312 (or 16310 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 621103540 is about 24921.9489607053. The cubic root of 621103540 is about 853.2075074214.

Adding to 621103540 its reverse (45301126), we get a palindrome (666404666).

The spelling of 621103540 in words is "six hundred twenty-one million, one hundred three thousand, five hundred forty".