6778538 has 8 divisors (see below), whose sum is σ = 10949988. Its totient is φ = 3128544.

The previous prime is 6778517. The next prime is 6778543. The reversal of 6778538 is 8358776.

It can be written as a sum of positive squares in 2 ways, for example, as 5508409 + 1270129 = 2347^2 + 1127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130331 + ... + 130382.

Almost surely, 2^6778538 is an apocalyptic number.

6778538 is a deficient number, since it is larger than the sum of its proper divisors (4171450).

6778538 is a wasteful number, since it uses less digits than its factorization.

6778538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260728.

The product of its digits is 282240, while the sum is 44.

The square root of 6778538 is about 2603.5625592637. The cubic root of 6778538 is about 189.2541209947.

The spelling of 6778538 in words is "six million, seven hundred seventy-eight thousand, five hundred thirty-eight".