6720569856 has 960 divisors, whose sum is σ = 27454242816. Its totient is φ = 1526169600.

The previous prime is 6720569837. The next prime is 6720569879. The reversal of 6720569856 is 6589650276.

It is a happy number.

6720569856 is a `hidden beast` number, since 6 + 7 + 20 + 569 + 8 + 56 = 666.

It is a harmonic number, since the harmonic mean of its divisors is an integer.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 142990825 + ... + 142990871.

Almost surely, 2^6720569856 is an apocalyptic number.

6720569856 is a gapful number since it is divisible by the number (66) 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 6720569856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13727121408).

6720569856 is an abundant number, since it is smaller than the sum of its proper divisors (20733672960).

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

6720569856 is a wasteful number, since it uses less digits than its factorization.

6720569856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The square root of 6720569856 is about 81979.0818196935. The cubic root of 6720569856 is about 1887.1309320122.

The spelling of 6720569856 in words is "six billion, seven hundred twenty million, five hundred sixty-nine thousand, eight hundred fifty-six".