6777643 has 4 divisors (see below), whose sum is σ = 6806008. Its totient is φ = 6749280.

The previous prime is 6777637. The next prime is 6777691. The reversal of 6777643 is 3467776.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6777643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6777596 and 6777605.

It is not an unprimeable number, because it can be changed into a prime (6777613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13821 + ... + 14302.

It is an arithmetic number, because the mean of its divisors is an integer number (1701502).

Almost surely, 2^6777643 is an apocalyptic number.

6777643 is a deficient number, since it is larger than the sum of its proper divisors (28365).

6777643 is a wasteful number, since it uses less digits than its factorization.

6777643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28364.

The product of its digits is 148176, while the sum is 40.

The square root of 6777643 is about 2603.3906737176. The cubic root of 6777643 is about 189.2457912785.

The spelling of 6777643 in words is "six million, seven hundred seventy-seven thousand, six hundred forty-three".