6720128371 has 6 divisors (see below), whose sum is σ = 7386587516. Its totient is φ = 6109207500.

The previous prime is 6720128353. The next prime is 6720128381. The reversal of 6720128371 is 1738210276.

It is not a de Polignac number, because 6720128371 - 2⁷ = 6720128243 is a prime.

It is a super-2 number, since 2×6720128371² = 90320250645438227282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6720128371.

It is not an unprimeable number, because it can be changed into a prime (6720128351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27769005 + ... + 27769246.

Almost surely, 2^6720128371 is an apocalyptic number.

6720128371 is a deficient number, since it is larger than the sum of its proper divisors (666459145).

6720128371 is a wasteful number, since it uses less digits than its factorization.

6720128371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55538273 (or 55538262 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 6720128371 is about 81976.3891068642. The cubic root of 6720128371 is about 1887.0896082226.

The spelling of 6720128371 in words is "six billion, seven hundred twenty million, one hundred twenty-eight thousand, three hundred seventy-one".