81893244 has 24 divisors (see below), whose sum is σ = 191289168. Its totient is φ = 27268480.

The previous prime is 81893243. The next prime is 81893281. The reversal of 81893244 is 44239818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10054 + ... + 16274.

It is an arithmetic number, because the mean of its divisors is an integer number (7970382).

Almost surely, 2^81893244 is an apocalyptic number.

It is an amenable number.

81893244 is an abundant number, since it is smaller than the sum of its proper divisors (109395924).

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

81893244 is a wasteful number, since it uses less digits than its factorization.

81893244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325 (or 7323 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 81893244 is about 9049.4886043356. The cubic root of 81893244 is about 434.2595303309.

The spelling of 81893244 in words is "eighty-one million, eight hundred ninety-three thousand, two hundred forty-four".