6990978 has 16 divisors (see below), whose sum is σ = 14804640. Its totient is φ = 2193216.

The previous prime is 6990967. The next prime is 6991003. The reversal of 6990978 is 8790996.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34168 + ... + 34371.

It is an arithmetic number, because the mean of its divisors is an integer number (925290).

Almost surely, 2^6990978 is an apocalyptic number.

6990978 is an abundant number, since it is smaller than the sum of its proper divisors (7813662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6990978 is a wasteful number, since it uses less digits than its factorization.

6990978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68561.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 6990978 is about 2644.0457635979. The cubic root of 6990978 is about 191.2108997772.

The spelling of 6990978 in words is "six million, nine hundred ninety thousand, nine hundred seventy-eight".