6568721280 has 384 divisors, whose sum is σ = 25330631040. Its totient is φ = 1554739200.

The previous prime is 6568721231. The next prime is 6568721303. The reversal of 6568721280 is 821278656.

6568721280 is a `hidden beast` number, since 6 + 568 + 7 + 2 + 1 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2723275 + ... + 2725685.

It is an arithmetic number, because the mean of its divisors is an integer number (65965185).

Almost surely, 2^6568721280 is an apocalyptic number.

6568721280 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 6568721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12665315520).

6568721280 is an abundant number, since it is smaller than the sum of its proper divisors (18761909760).

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

6568721280 is a wasteful number, since it uses less digits than its factorization.

6568721280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 6568721280 is about 81047.6482077056. The cubic root of 6568721280 is about 1872.8095337205.

The spelling of 6568721280 in words is "six billion, five hundred sixty-eight million, seven hundred twenty-one thousand, two hundred eighty".