81084894 has 32 divisors (see below), whose sum is σ = 186226560. Its totient is φ = 23277600.

The previous prime is 81084851. The next prime is 81084901. The reversal of 81084894 is 49848018.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31077 + ... + 33584.

It is an arithmetic number, because the mean of its divisors is an integer number (5819580).

Almost surely, 2^81084894 is an apocalyptic number.

81084894 is an abundant number, since it is smaller than the sum of its proper divisors (105141666).

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

81084894 is a wasteful number, since it uses less digits than its factorization.

81084894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64696.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 81084894 is about 9004.7150982138. The cubic root of 81084894 is about 432.8259767528.

The spelling of 81084894 in words is "eighty-one million, eighty-four thousand, eight hundred ninety-four".