81545806 has 8 divisors (see below), whose sum is σ = 122844384. Its totient is φ = 40597680.

The previous prime is 81545801. The next prime is 81545813. The reversal of 81545806 is 60854518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81545801) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 87030 + ... + 87961.

It is an arithmetic number, because the mean of its divisors is an integer number (15355548).

Almost surely, 2^81545806 is an apocalyptic number.

81545806 is a deficient number, since it is larger than the sum of its proper divisors (41298578).

81545806 is a wasteful number, since it uses less digits than its factorization.

81545806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175226.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 81545806 is about 9030.2716459695. The cubic root of 81545806 is about 433.6445339840.

The spelling of 81545806 in words is "eighty-one million, five hundred forty-five thousand, eight hundred six".