6406779 has 8 divisors (see below), whose sum is σ = 8599552. Its totient is φ = 4242600.

The previous prime is 6406759. The next prime is 6406787. The reversal of 6406779 is 9776046.

6406779 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6406779 - 2⁵ = 6406747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6406759) 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, 6619 + ... + 7524.

It is an arithmetic number, because the mean of its divisors is an integer number (1074944).

Almost surely, 2^6406779 is an apocalyptic number.

6406779 is a deficient number, since it is larger than the sum of its proper divisors (2192773).

6406779 is a wasteful number, since it uses less digits than its factorization.

6406779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14297.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 6406779 is about 2531.1615910487. The cubic root of 6406779 is about 185.7290829855.

It can be divided in two parts, 64067 and 79, that added together give a palindrome (64146).

The spelling of 6406779 in words is "six million, four hundred six thousand, seven hundred seventy-nine".