6579778 has 4 divisors (see below), whose sum is σ = 9869670. Its totient is φ = 3289888.

The previous prime is 6579767. The next prime is 6579779. The reversal of 6579778 is 8779756.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3814209 + 2765569 = 1953^2 + 1663^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6579779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1644943 + ... + 1644946.

Almost surely, 2^6579778 is an apocalyptic number.

6579778 is a deficient number, since it is larger than the sum of its proper divisors (3289892).

6579778 is a wasteful number, since it uses less digits than its factorization.

6579778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289891.

The product of its digits is 740880, while the sum is 49.

The square root of 6579778 is about 2565.1077950059. The cubic root of 6579778 is about 187.3859739296.

The spelling of 6579778 in words is "six million, five hundred seventy-nine thousand, seven hundred seventy-eight".