6777777 has 8 divisors (see below), whose sum is σ = 9066816. Its totient is φ = 4503632.

The previous prime is 6777769. The next prime is 6777803. The reversal of 6777777 is 7777776.

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 6777777 - 2³ = 6777769 is a prime.

It is a super-2 number, since 2×6777777² = 91876522123458, which contains 22 as substring.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6777707) 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, 2613 + ... + 4514.

It is an arithmetic number, because the mean of its divisors is an integer number (1133352).

Almost surely, 2^6777777 is an apocalyptic number.

It is an amenable number.

6777777 is a deficient number, since it is larger than the sum of its proper divisors (2289039).

6777777 is a wasteful number, since it uses less digits than its factorization.

6777777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7447.

The product of its digits is 705894, while the sum is 48.

The square root of 6777777 is about 2603.4164092592. The cubic root of 6777777 is about 189.2470384559.

Subtracting 6777777 from its reverse (7777776), we obtain a palindrome (999999).

The spelling of 6777777 in words is "six million, seven hundred seventy-seven thousand, seven hundred seventy-seven".