6978663 has 8 divisors (see below), whose sum is σ = 10338800. Its totient is φ = 4652424.

The previous prime is 6978659. The next prime is 6978677. The reversal of 6978663 is 3668796.

It is not a de Polignac number, because 6978663 - 2² = 6978659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129208 + ... + 129261.

It is an arithmetic number, because the mean of its divisors is an integer number (1292350).

Almost surely, 2^6978663 is an apocalyptic number.

6978663 is a deficient number, since it is larger than the sum of its proper divisors (3360137).

6978663 is a wasteful number, since it uses less digits than its factorization.

6978663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258478 (or 258472 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 6978663 is about 2641.7159196250. The cubic root of 6978663 is about 191.0985575428.

The spelling of 6978663 in words is "six million, nine hundred seventy-eight thousand, six hundred sixty-three".