6720129036 has 168 divisors, whose sum is σ = 19276113024. Its totient is φ = 2039800320.

The previous prime is 6720129001. The next prime is 6720129041. The reversal of 6720129036 is 6309210276.

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 polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1534546 + ... + 1538918.

It is an arithmetic number, because the mean of its divisors is an integer number (114738768).

Almost surely, 2^6720129036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6720129036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9638056512).

6720129036 is an abundant number, since it is smaller than the sum of its proper divisors (12555983988).

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

6720129036 is a wasteful number, since it uses less digits than its factorization.

6720129036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4443 (or 4426 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 6720129036 is about 81976.3931629100. The cubic root of 6720129036 is about 1887.0896704692.

The spelling of 6720129036 in words is "six billion, seven hundred twenty million, one hundred twenty-nine thousand, thirty-six".