81812248 has 32 divisors (see below), whose sum is σ = 181360800. Its totient is φ = 33852672.

The previous prime is 81812243. The next prime is 81812267. The reversal of 81812248 is 84221818.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81812243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23565 + ... + 26812.

It is an arithmetic number, because the mean of its divisors is an integer number (5667525).

Almost surely, 2^81812248 is an apocalyptic number.

It is an amenable number.

81812248 is an abundant number, since it is smaller than the sum of its proper divisors (99548552).

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

81812248 is a wasteful number, since it uses less digits than its factorization.

81812248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50419 (or 50415 counting only the distinct ones).

The product of its digits is 8192, while the sum is 34.

The square root of 81812248 is about 9045.0123272442. The cubic root of 81812248 is about 434.1163158826.

The spelling of 81812248 in words is "eighty-one million, eight hundred twelve thousand, two hundred forty-eight".