7065721720 has 64 divisors (see below), whose sum is σ = 16124472000. Its totient is φ = 2786254848.

The previous prime is 7065721673. The next prime is 7065721723. The reversal of 7065721720 is 271275607.

It is a self number, because there is not a number n which added to its sum of digits gives 7065721720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7065721723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939736 + ... + 947224.

It is an arithmetic number, because the mean of its divisors is an integer number (251944875).

Almost surely, 2^7065721720 is an apocalyptic number.

It is an amenable number.

7065721720 is an abundant number, since it is smaller than the sum of its proper divisors (9058750280).

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

7065721720 is a wasteful number, since it uses less digits than its factorization.

7065721720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832 (or 7828 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 37.

The square root of 7065721720 is about 84057.8474623280. The cubic root of 7065721720 is about 1918.8992641788.

The spelling of 7065721720 in words is "seven billion, sixty-five million, seven hundred twenty-one thousand, seven hundred twenty".