81864214 has 8 divisors (see below), whose sum is σ = 130019688. Its totient is φ = 38524320.

The previous prime is 81864193. The next prime is 81864221. The reversal of 81864214 is 41246818.

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 2407771 = 81864214 / (8 + 1 + 8 + 6 + 4 + 2 + 1 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 81864214.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203852 + ... + 1203919.

It is an arithmetic number, because the mean of its divisors is an integer number (16252461).

Almost surely, 2^81864214 is an apocalyptic number.

81864214 is a deficient number, since it is larger than the sum of its proper divisors (48155474).

81864214 is a wasteful number, since it uses less digits than its factorization.

81864214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407790.

The product of its digits is 12288, while the sum is 34.

The square root of 81864214 is about 9047.8845041258. The cubic root of 81864214 is about 434.2082113068.

The spelling of 81864214 in words is "eighty-one million, eight hundred sixty-four thousand, two hundred fourteen".