6442978 has 8 divisors (see below), whose sum is σ = 9976320. Its totient is φ = 3117540.

The previous prime is 6442939. The next prime is 6442979. The reversal of 6442978 is 8792446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6442978.

It is not an unprimeable number, because it can be changed into a prime (6442979) 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, 51898 + ... + 52021.

It is an arithmetic number, because the mean of its divisors is an integer number (1247040).

Almost surely, 2^6442978 is an apocalyptic number.

6442978 is a deficient number, since it is larger than the sum of its proper divisors (3533342).

6442978 is a wasteful number, since it uses less digits than its factorization.

6442978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103952.

The product of its digits is 96768, while the sum is 40.

The square root of 6442978 is about 2538.3021884717. The cubic root of 6442978 is about 186.0782227736.

The spelling of 6442978 in words is "six million, four hundred forty-two thousand, nine hundred seventy-eight".