84678138 has 24 divisors (see below), whose sum is σ = 184874976. Its totient is φ = 28009800.

The previous prime is 84678127. The next prime is 84678149. The reversal of 84678138 is 83187648.

It is an interprime number because it is at equal distance from previous prime (84678127) and next prime (84678149).

It is a junction number, because it is equal to n+sod(n) for n = 84678093 and 84678102.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15598 + ... + 20313.

It is an arithmetic number, because the mean of its divisors is an integer number (7703124).

Almost surely, 2^84678138 is an apocalyptic number.

84678138 is an abundant number, since it is smaller than the sum of its proper divisors (100196838).

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

84678138 is a wasteful number, since it uses less digits than its factorization.

84678138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36050 (or 36047 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 84678138 is about 9202.0724839571. The cubic root of 84678138 is about 439.1272956883.

The spelling of 84678138 in words is "eighty-four million, six hundred seventy-eight thousand, one hundred thirty-eight".