84668978 has 16 divisors (see below), whose sum is σ = 136799520. Its totient is φ = 39172896.

The previous prime is 84668971. The next prime is 84668989. The reversal of 84668978 is 87986648.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84668971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24275 + ... + 27542.

It is an arithmetic number, because the mean of its divisors is an integer number (8549970).

Almost surely, 2^84668978 is an apocalyptic number.

84668978 is a deficient number, since it is larger than the sum of its proper divisors (52130542).

84668978 is a wasteful number, since it uses less digits than its factorization.

84668978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51881.

The product of its digits is 4644864, while the sum is 56.

The square root of 84668978 is about 9201.5747565294. The cubic root of 84668978 is about 439.1114610184. Note that the first 3 decimals are identical.

The spelling of 84668978 in words is "eighty-four million, six hundred sixty-eight thousand, nine hundred seventy-eight".