6728391697 has 8 divisors (see below), whose sum is σ = 6746961312. Its totient is φ = 6709840800.

The previous prime is 6728391679. The next prime is 6728391707. The reversal of 6728391697 is 7961938276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6728391697 - 2⁷ = 6728391569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6728391617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991797 + ... + 998557.

It is an arithmetic number, because the mean of its divisors is an integer number (843370164).

Almost surely, 2^6728391697 is an apocalyptic number.

It is an amenable number.

6728391697 is a deficient number, since it is larger than the sum of its proper divisors (18569615).

6728391697 is a wasteful number, since it uses less digits than its factorization.

6728391697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9359.

The product of its digits is 6858432, while the sum is 58.

The square root of 6728391697 is about 82026.7742691373. The cubic root of 6728391697 is about 1887.8627705104.

The spelling of 6728391697 in words is "six billion, seven hundred twenty-eight million, three hundred ninety-one thousand, six hundred ninety-seven".