81750806 has 8 divisors (see below), whose sum is σ = 129080280. Its totient is φ = 38724048.

The previous prime is 81750803. The next prime is 81750817. The reversal of 81750806 is 60805718.

It is a happy number.

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 (81750803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075631 + ... + 1075706.

It is an arithmetic number, because the mean of its divisors is an integer number (16135035).

Almost surely, 2^81750806 is an apocalyptic number.

81750806 is a deficient number, since it is larger than the sum of its proper divisors (47329474).

81750806 is a wasteful number, since it uses less digits than its factorization.

81750806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151358.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 81750806 is about 9041.6152318045. The cubic root of 81750806 is about 434.0076131095.

The spelling of 81750806 in words is "eighty-one million, seven hundred fifty thousand, eight hundred six".