81775834 has 8 divisors (see below), whose sum is σ = 140187168. Its totient is φ = 35046780.

The previous prime is 81775801. The next prime is 81775871. The reversal of 81775834 is 43857718.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2920552 + ... + 2920579.

It is an arithmetic number, because the mean of its divisors is an integer number (17523396).

Almost surely, 2^81775834 is an apocalyptic number.

81775834 is a deficient number, since it is larger than the sum of its proper divisors (58411334).

81775834 is a wasteful number, since it uses less digits than its factorization.

81775834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5841140.

The product of its digits is 188160, while the sum is 43.

The square root of 81775834 is about 9042.9991706292. Note that the first 3 decimals coincide. The cubic root of 81775834 is about 434.0518990509.

The spelling of 81775834 in words is "eighty-one million, seven hundred seventy-five thousand, eight hundred thirty-four".