81066804 has 96 divisors (see below), whose sum is σ = 236818176. Its totient is φ = 21012480.

The previous prime is 81066763. The next prime is 81066841. The reversal of 81066804 is 40866018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66004 + ... + 67220.

It is an arithmetic number, because the mean of its divisors is an integer number (2466856).

Almost surely, 2^81066804 is an apocalyptic number.

81066804 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81066804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118409088).

81066804 is an abundant number, since it is smaller than the sum of its proper divisors (155751372).

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

81066804 is a wasteful number, since it uses less digits than its factorization.

81066804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81066804 is about 9003.7105684268. The cubic root of 81066804 is about 432.7937866046.

The spelling of 81066804 in words is "eighty-one million, sixty-six thousand, eight hundred four".