81248944 has 20 divisors (see below), whose sum is σ = 179908624. Its totient is φ = 34820928.

The previous prime is 81248941. The next prime is 81248953. The reversal of 81248944 is 44984218.

It is a happy number.

It is a super-2 number, since 2×81248944² = 13202781802230272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81248897 and 81248906.

It is not an unprimeable number, because it can be changed into a prime (81248941) by changing a digit.

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, 362607 + ... + 362830.

Almost surely, 2^81248944 is an apocalyptic number.

It is an amenable number.

81248944 is an abundant number, since it is smaller than the sum of its proper divisors (98659680).

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

81248944 is a wasteful number, since it uses less digits than its factorization.

81248944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725452 (or 725446 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 81248944 is about 9013.8196121289. The cubic root of 81248944 is about 433.1176762552.

The spelling of 81248944 in words is "eighty-one million, two hundred forty-eight thousand, nine hundred forty-four".