6778540 has 12 divisors (see below), whose sum is σ = 14234976. Its totient is φ = 2711408.

The previous prime is 6778517. The next prime is 6778543. The reversal of 6778540 is 458776.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6778540.

It is not an unprimeable number, because it can be changed into a prime (6778543) 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, 169444 + ... + 169483.

It is an arithmetic number, because the mean of its divisors is an integer number (1186248).

Almost surely, 2^6778540 is an apocalyptic number.

It is an amenable number.

6778540 is an abundant number, since it is smaller than the sum of its proper divisors (7456436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6778540 is a wasteful number, since it uses less digits than its factorization.

6778540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338936 (or 338934 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 6778540 is about 2603.5629433528. The cubic root of 6778540 is about 189.2541396078.

The spelling of 6778540 in words is "six million, seven hundred seventy-eight thousand, five hundred forty".