81805246 has 8 divisors (see below), whose sum is σ = 122795064. Its totient is φ = 40873560.

The previous prime is 81805237. The next prime is 81805267. The reversal of 81805246 is 64250818.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10825 + ... + 16756.

It is an arithmetic number, because the mean of its divisors is an integer number (15349383).

Almost surely, 2^81805246 is an apocalyptic number.

81805246 is a deficient number, since it is larger than the sum of its proper divisors (40989818).

81805246 is a wasteful number, since it uses less digits than its factorization.

81805246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29066.

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

The square root of 81805246 is about 9044.6252548129. The cubic root of 81805246 is about 434.1039307397.

The spelling of 81805246 in words is "eighty-one million, eight hundred five thousand, two hundred forty-six".