81100048 has 20 divisors (see below), whose sum is σ = 157277260. Its totient is φ = 40512384.

The previous prime is 81100039. The next prime is 81100079. The reversal of 81100048 is 84000118.

It can be written as a sum of positive squares in 2 ways, for example, as 56972304 + 24127744 = 7548^2 + 4912^2 .

It is a congruent number.

It is an unprimeable number.

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, 25186 + ... + 28222.

It is an arithmetic number, because the mean of its divisors is an integer number (7863863).

Almost surely, 2^81100048 is an apocalyptic number.

It is an amenable number.

81100048 is a deficient number, since it is larger than the sum of its proper divisors (76177212).

81100048 is a wasteful number, since it uses less digits than its factorization.

81100048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714 (or 4708 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 81100048 is about 9005.5565069572. The cubic root of 81100048 is about 432.8529387674.

The spelling of 81100048 in words is "eighty-one million, one hundred thousand, forty-eight".