6778493 has 4 divisors (see below), whose sum is σ = 6783708. Its totient is φ = 6773280.

The previous prime is 6778483. The next prime is 6778517. The reversal of 6778493 is 3948776.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3545689 + 3232804 = 1883^2 + 1798^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778493 - 2⁸ = 6778237 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778403) 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, 1103 + ... + 3843.

It is an arithmetic number, because the mean of its divisors is an integer number (1695927).

Almost surely, 2^6778493 is an apocalyptic number.

It is an amenable number.

6778493 is a deficient number, since it is larger than the sum of its proper divisors (5215).

6778493 is a wasteful number, since it uses less digits than its factorization.

6778493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214.

The product of its digits is 254016, while the sum is 44.

The square root of 6778493 is about 2603.5539172447. The cubic root of 6778493 is about 189.2537021997.

The spelling of 6778493 in words is "six million, seven hundred seventy-eight thousand, four hundred ninety-three".