6722978 has 4 divisors (see below), whose sum is σ = 10084470. Its totient is φ = 3361488.

The previous prime is 6722957. The next prime is 6722987. The reversal of 6722978 is 8792276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3508129 + 3214849 = 1873^2 + 1793^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680743 + ... + 1680746.

Almost surely, 2^6722978 is an apocalyptic number.

6722978 is a deficient number, since it is larger than the sum of its proper divisors (3361492).

6722978 is a wasteful number, since it uses less digits than its factorization.

6722978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361491.

The product of its digits is 84672, while the sum is 41.

The square root of 6722978 is about 2592.8706099611. The cubic root of 6722978 is about 188.7356306766.

The spelling of 6722978 in words is "six million, seven hundred twenty-two thousand, nine hundred seventy-eight".