81205248 has 48 divisors (see below), whose sum is σ = 216510840. Its totient is φ = 27066368.

The previous prime is 81205247. The next prime is 81205261. The reversal of 81205248 is 84250218.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81205247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465 + ... + 12752.

Almost surely, 2^81205248 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 81205248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108255420).

81205248 is an abundant number, since it is smaller than the sum of its proper divisors (135305592).

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

81205248 is a wasteful number, since it uses less digits than its factorization.

81205248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13242 (or 13222 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 81205248 is about 9011.3954524258. The cubic root of 81205248 is about 433.0400182049.

The spelling of 81205248 in words is "eighty-one million, two hundred five thousand, two hundred forty-eight".