81084878 has 16 divisors (see below), whose sum is σ = 139411584. Its totient is φ = 34648440.

The previous prime is 81084851. The next prime is 81084901. The reversal of 81084878 is 87848018.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3488 + ... + 13203.

It is an arithmetic number, because the mean of its divisors is an integer number (8713224).

Almost surely, 2^81084878 is an apocalyptic number.

81084878 is a deficient number, since it is larger than the sum of its proper divisors (58326706).

81084878 is a wasteful number, since it uses less digits than its factorization.

81084878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17047.

The product of its (nonzero) digits is 114688, while the sum is 44.

The square root of 81084878 is about 9004.7142097903. The cubic root of 81084878 is about 432.8259482838.

The spelling of 81084878 in words is "eighty-one million, eighty-four thousand, eight hundred seventy-eight".