81367244 has 36 divisors (see below), whose sum is σ = 166957560. Its totient is φ = 34594560.

The previous prime is 81367211. The next prime is 81367259. The reversal of 81367244 is 44276318.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24092 + ... + 27260.

It is an arithmetic number, because the mean of its divisors is an integer number (4637710).

Almost surely, 2^81367244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81367244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83478780).

81367244 is an abundant number, since it is smaller than the sum of its proper divisors (85590316).

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

81367244 is a wasteful number, since it uses less digits than its factorization.

81367244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3309 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 81367244 is about 9020.3793711795. The cubic root of 81367244 is about 433.3277834924.

The spelling of 81367244 in words is "eighty-one million, three hundred sixty-seven thousand, two hundred forty-four".