6397756779 has 8 divisors (see below), whose sum is σ = 8979307840. Its totient is φ = 4040688456.

The previous prime is 6397756759. The next prime is 6397756801. The reversal of 6397756779 is 9776577936.

It is a happy number.

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

It is not a de Polignac number, because 6397756779 - 2⁵ = 6397756747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6397756709) 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, 56120617 + ... + 56120730.

It is an arithmetic number, because the mean of its divisors is an integer number (1122413480).

Almost surely, 2^6397756779 is an apocalyptic number.

6397756779 is a deficient number, since it is larger than the sum of its proper divisors (2581551061).

6397756779 is a wasteful number, since it uses less digits than its factorization.

6397756779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112241369.

The product of its digits is 105019740, while the sum is 66.

The square root of 6397756779 is about 79985.9786400092. The cubic root of 6397756779 is about 1856.4185891477.

The spelling of 6397756779 in words is "six billion, three hundred ninety-seven million, seven hundred fifty-six thousand, seven hundred seventy-nine".