81066456 has 24 divisors (see below), whose sum is σ = 219555180. Its totient is φ = 27022128.

The previous prime is 81066409. The next prime is 81066473. The reversal of 81066456 is 65466018.

81066456 is a `hidden beast` number, since 8 + 1 + 0 + 6 + 645 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81066456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562890 + ... + 563033.

Almost surely, 2^81066456 is an apocalyptic number.

It is an amenable number.

81066456 is an abundant number, since it is smaller than the sum of its proper divisors (138488724).

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

81066456 is a wasteful number, since it uses less digits than its factorization.

81066456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125935 (or 1125928 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 81066456 is about 9003.6912430403. The cubic root of 81066456 is about 432.7931673110.

The spelling of 81066456 in words is "eighty-one million, sixty-six thousand, four hundred fifty-six".