6778745 has 4 divisors (see below), whose sum is σ = 8134500. Its totient is φ = 5422992.

The previous prime is 6778741. The next prime is 6778769. The reversal of 6778745 is 5478776.

6778745 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2301289 + 4477456 = 1517^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778745 - 2² = 6778741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6778696 and 6778705.

It is not an unprimeable number, because it can be changed into a prime (6778741) 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, 677870 + ... + 677879.

It is an arithmetic number, because the mean of its divisors is an integer number (2033625).

Almost surely, 2^6778745 is an apocalyptic number.

It is an amenable number.

6778745 is a deficient number, since it is larger than the sum of its proper divisors (1355755).

6778745 is a wasteful number, since it uses less digits than its factorization.

6778745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355754.

The product of its digits is 329280, while the sum is 44.

The square root of 6778745 is about 2603.6023121821. The cubic root of 6778745 is about 189.2560474280.

The spelling of 6778745 in words is "six million, seven hundred seventy-eight thousand, seven hundred forty-five".