6978775 has 24 divisors (see below), whose sum is σ = 9240480. Its totient is φ = 5216640.

The previous prime is 6978761. The next prime is 6978779. The reversal of 6978775 is 5778796.

It is not a de Polignac number, because 6978775 - 2⁵ = 6978743 is a prime.

Its product of digits (740880) is a multiple of the sum of its prime factors (315).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30361 + ... + 30589.

It is an arithmetic number, because the mean of its divisors is an integer number (385020).

Almost surely, 2^6978775 is an apocalyptic number.

6978775 is a deficient number, since it is larger than the sum of its proper divisors (2261705).

6978775 is a wasteful number, since it uses less digits than its factorization.

6978775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 310 counting only the distinct ones).

The product of its digits is 740880, while the sum is 49.

The square root of 6978775 is about 2641.7371178829. The cubic root of 6978775 is about 191.0995798458.

The spelling of 6978775 in words is "six million, nine hundred seventy-eight thousand, seven hundred seventy-five".