81244356 has 12 divisors (see below), whose sum is σ = 189570192. Its totient is φ = 27081448.

The previous prime is 81244327. The next prime is 81244363. The reversal of 81244356 is 65344218.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3385170 + ... + 3385193.

It is an arithmetic number, because the mean of its divisors is an integer number (15797516).

Almost surely, 2^81244356 is an apocalyptic number.

It is an amenable number.

81244356 is an abundant number, since it is smaller than the sum of its proper divisors (108325836).

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

81244356 is a wasteful number, since it uses less digits than its factorization.

81244356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770370 (or 6770368 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 81244356 is about 9013.5651104322. The cubic root of 81244356 is about 433.1095236105.

The spelling of 81244356 in words is "eighty-one million, two hundred forty-four thousand, three hundred fifty-six".