6978787 has 4 divisors (see below), whose sum is σ = 7083016. Its totient is φ = 6874560.

The previous prime is 6978779. The next prime is 6978793. The reversal of 6978787 is 7878796.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6978787 - 2³ = 6978779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6978707) 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, 52014 + ... + 52147.

It is an arithmetic number, because the mean of its divisors is an integer number (1770754).

Almost surely, 2^6978787 is an apocalyptic number.

6978787 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6978787 is a deficient number, since it is larger than the sum of its proper divisors (104229).

6978787 is a wasteful number, since it uses less digits than its factorization.

6978787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104228.

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

The square root of 6978787 is about 2641.7393891147. The cubic root of 6978787 is about 191.0996893776.

Subtracting 6978787 from its reverse (7878796), we obtain a palindrome (900009).

The spelling of 6978787 in words is "six million, nine hundred seventy-eight thousand, seven hundred eighty-seven".