621516630 has 64 divisors (see below), whose sum is σ = 1721668608. Its totient is φ = 140649600.

The previous prime is 621516629. The next prime is 621516641. The reversal of 621516630 is 36615126.

621516630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6559 + ... + 35861.

It is an arithmetic number, because the mean of its divisors is an integer number (26901072).

Almost surely, 2^621516630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621516630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860834304).

621516630 is an abundant number, since it is smaller than the sum of its proper divisors (1100151978).

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

621516630 is a wasteful number, since it uses less digits than its factorization.

621516630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29421.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 621516630 is about 24930.2352576144. The cubic root of 621516630 is about 853.3966188755.

The spelling of 621516630 in words is "six hundred twenty-one million, five hundred sixteen thousand, six hundred thirty".