81049248 has 144 divisors (see below), whose sum is σ = 273349440. Its totient is φ = 23141376.

The previous prime is 81049247. The next prime is 81049253. The reversal of 81049248 is 84294018.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81049247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53688 + ... + 55176.

It is an arithmetic number, because the mean of its divisors is an integer number (1898260).

Almost surely, 2^81049248 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 81049248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136674720).

81049248 is an abundant number, since it is smaller than the sum of its proper divisors (192300192).

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

81049248 is a wasteful number, since it uses less digits than its factorization.

81049248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81049248 is about 9002.7355842544. The cubic root of 81049248 is about 432.7625421005.

The spelling of 81049248 in words is "eighty-one million, forty-nine thousand, two hundred forty-eight".