81448516 has 24 divisors (see below), whose sum is σ = 150353280. Its totient is φ = 38499552.

The previous prime is 81448469. The next prime is 81448531. The reversal of 81448516 is 61584418.

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 7 ways as a sum of consecutive naturals, for example, 50661 + ... + 52243.

It is an arithmetic number, because the mean of its divisors is an integer number (6264720).

Almost surely, 2^81448516 is an apocalyptic number.

It is an amenable number.

81448516 is a deficient number, since it is larger than the sum of its proper divisors (68904764).

81448516 is a wasteful number, since it uses less digits than its factorization.

81448516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283 (or 2281 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 81448516 is about 9024.8831571384. The cubic root of 81448516 is about 433.4720090021.

The spelling of 81448516 in words is "eighty-one million, four hundred forty-eight thousand, five hundred sixteen".