81994846 has 8 divisors (see below), whose sum is σ = 123162264. Its totient is φ = 40940760.

The previous prime is 81994817. The next prime is 81994867. The reversal of 81994846 is 64849918.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81994846.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26500 + ... + 29431.

It is an arithmetic number, because the mean of its divisors is an integer number (15395283).

Almost surely, 2^81994846 is an apocalyptic number.

81994846 is a deficient number, since it is larger than the sum of its proper divisors (41167418).

81994846 is a wasteful number, since it uses less digits than its factorization.

81994846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56666.

The product of its digits is 497664, while the sum is 49.

The square root of 81994846 is about 9055.1005516228. The cubic root of 81994846 is about 434.4390461676.

The spelling of 81994846 in words is "eighty-one million, nine hundred ninety-four thousand, eight hundred forty-six".