81761854 has 8 divisors (see below), whose sum is σ = 122681160. Its totient is φ = 40868136.

The previous prime is 81761851. The next prime is 81761873. The reversal of 81761854 is 45816718.

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 (81761851) by changing a digit.

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, 9177 + ... + 15739.

It is an arithmetic number, because the mean of its divisors is an integer number (15335145).

Almost surely, 2^81761854 is an apocalyptic number.

81761854 is a deficient number, since it is larger than the sum of its proper divisors (40919306).

81761854 is a wasteful number, since it uses less digits than its factorization.

81761854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12794.

The product of its digits is 53760, while the sum is 40.

The square root of 81761854 is about 9042.2261639488. The cubic root of 81761854 is about 434.0271631721.

The spelling of 81761854 in words is "eighty-one million, seven hundred sixty-one thousand, eight hundred fifty-four".