621440130 has 48 divisors (see below), whose sum is σ = 1544721984. Its totient is φ = 159996480.

The previous prime is 621440081. The next prime is 621440147. The reversal of 621440130 is 31044126.

It is a junction number, because it is equal to n+sod(n) for n = 621440097 and 621440106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12915 + ... + 37545.

It is an arithmetic number, because the mean of its divisors is an integer number (32181708).

Almost surely, 2^621440130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621440130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772360992).

621440130 is an abundant number, since it is smaller than the sum of its proper divisors (923281854).

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

621440130 is a wasteful number, since it uses less digits than its factorization.

621440130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24699 (or 24670 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 621440130 is about 24928.7009288491. The cubic root of 621440130 is about 853.3616037116.

Adding to 621440130 its reverse (31044126), we get a palindrome (652484256).

The spelling of 621440130 in words is "six hundred twenty-one million, four hundred forty thousand, one hundred thirty".