81244218 has 32 divisors (see below), whose sum is σ = 179407872. Its totient is φ = 24321200.

The previous prime is 81244201. The next prime is 81244259.

81244218 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1938 + ... + 12893.

It is an arithmetic number, because the mean of its divisors is an integer number (5606496).

Almost surely, 2^81244218 is an apocalyptic number.

81244218 is an abundant number, since it is smaller than the sum of its proper divisors (98163654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81244218 is a wasteful number, since it uses less digits than its factorization.

81244218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14930.

The product of its digits is 4096, while the sum is 30.

The square root of 81244218 is about 9013.5574553003. The cubic root of 81244218 is about 433.1092783867.

The spelling of 81244218 in words is "eighty-one million, two hundred forty-four thousand, two hundred eighteen".