6987778 has 8 divisors (see below), whose sum is σ = 11979072. Its totient is φ = 2994756.

The previous prime is 6987769. The next prime is 6987793. The reversal of 6987778 is 8777896.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249550 + ... + 249577.

It is an arithmetic number, because the mean of its divisors is an integer number (1497384).

Almost surely, 2^6987778 is an apocalyptic number.

6987778 is a deficient number, since it is larger than the sum of its proper divisors (4991294).

6987778 is a wasteful number, since it uses less digits than its factorization.

6987778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499136.

The product of its digits is 1185408, while the sum is 52.

The square root of 6987778 is about 2643.4405610870. The cubic root of 6987778 is about 191.1817208239.

The spelling of 6987778 in words is "six million, nine hundred eighty-seven thousand, seven hundred seventy-eight".