81503648 has 24 divisors (see below), whose sum is σ = 160665120. Its totient is φ = 40699840.

The previous prime is 81503641. The next prime is 81503663. The reversal of 81503648 is 84630518.

It is not an unprimeable number, because it can be changed into a prime (81503641) 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, 41243 + ... + 43173.

It is an arithmetic number, because the mean of its divisors is an integer number (6694380).

Almost surely, 2^81503648 is an apocalyptic number.

It is an amenable number.

81503648 is a deficient number, since it is larger than the sum of its proper divisors (79161472).

81503648 is a wasteful number, since it uses less digits than its factorization.

81503648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260 (or 3252 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81503648 is about 9027.9370844064. The cubic root of 81503648 is about 433.5697917890.

The spelling of 81503648 in words is "eighty-one million, five hundred three thousand, six hundred forty-eight".