81205846 has 8 divisors (see below), whose sum is σ = 121855824. Its totient is φ = 40587240.

The previous prime is 81205843. The next prime is 81205849. The reversal of 81205846 is 64850218.

It is an interprime number because it is at equal distance from previous prime (81205843) and next prime (81205849).

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 (81205843) 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, 336 + ... + 12748.

It is an arithmetic number, because the mean of its divisors is an integer number (15231978).

Almost surely, 2^81205846 is an apocalyptic number.

81205846 is a deficient number, since it is larger than the sum of its proper divisors (40649978).

81205846 is a wasteful number, since it uses less digits than its factorization.

81205846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15686.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 81205846 is about 9011.4286325754. The cubic root of 81205846 is about 433.0410811793.

The spelling of 81205846 in words is "eighty-one million, two hundred five thousand, eight hundred forty-six".