6621246720 has 288 divisors, whose sum is σ = 25633722240. Its totient is φ = 1605058560.

The previous prime is 6621246703. The next prime is 6621246811. The reversal of 6621246720 is 276421266.

6621246720 is a `hidden beast` number, since 6 + 621 + 2 + 4 + 6 + 7 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×6621246720² = 87681816254221516800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 371452 + ... + 388868.

It is an arithmetic number, because the mean of its divisors is an integer number (89005980).

Almost surely, 2^6621246720 is an apocalyptic number.

6621246720 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 6621246720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12816861120).

6621246720 is an abundant number, since it is smaller than the sum of its proper divisors (19012475520).

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

6621246720 is a wasteful number, since it uses less digits than its factorization.

6621246720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17458 (or 17438 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 6621246720 is about 81371.0434982863. The cubic root of 6621246720 is about 1877.7881335776.

Adding to 6621246720 its reverse (276421266), we get a palindrome (6897667986).

The spelling of 6621246720 in words is "six billion, six hundred twenty-one million, two hundred forty-six thousand, seven hundred twenty".