6621323730 has 64 divisors (see below), whose sum is σ = 18219921408. Its totient is φ = 1508564160.

The previous prime is 6621323713. The next prime is 6621323747. The reversal of 6621323730 is 373231266.

It is an interprime number because it is at equal distance from previous prime (6621323713) and next prime (6621323747).

It is a super-2 number, since 2×6621323730² = 87683855874922225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6621323691 and 6621323700.

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, 14619 + ... + 116001.

It is an arithmetic number, because the mean of its divisors is an integer number (284686272).

Almost surely, 2^6621323730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6621323730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9109960704).

6621323730 is an abundant number, since it is smaller than the sum of its proper divisors (11598597678).

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

6621323730 is a wasteful number, since it uses less digits than its factorization.

6621323730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101711.

The product of its (nonzero) digits is 27216, while the sum is 33.

The square root of 6621323730 is about 81371.5166996413. The cubic root of 6621323730 is about 1877.7954135713.

Adding to 6621323730 its reverse (373231266), we get a palindrome (6994554996).

The spelling of 6621323730 in words is "six billion, six hundred twenty-one million, three hundred twenty-three thousand, seven hundred thirty".