6978287 has 2 divisors, whose sum is σ = 6978288. Its totient is φ = 6978286.

The previous prime is 6978281. The next prime is 6978319. The reversal of 6978287 is 7828796.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6978287 - 2⁸ = 6978031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6978281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3489143 + 3489144.

It is an arithmetic number, because the mean of its divisors is an integer number (3489144).

Almost surely, 2^6978287 is an apocalyptic number.

6978287 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978287 is an equidigital number, since it uses as much as digits as its factorization.

6978287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 6978287 is about 2641.6447528008. The cubic root of 6978287 is about 191.0951254456.

The spelling of 6978287 in words is "six million, nine hundred seventy-eight thousand, two hundred eighty-seven".