81648414 has 12 divisors (see below), whose sum is σ = 176904936. Its totient is φ = 27216132.

The previous prime is 81648403. The next prime is 81648419. The reversal of 81648414 is 41484618.

81648414 is a `hidden beast` number, since 8 + 1 + 648 + 4 + 1 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81648419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2267994 + ... + 2268029.

It is an arithmetic number, because the mean of its divisors is an integer number (14742078).

Almost surely, 2^81648414 is an apocalyptic number.

81648414 is an abundant number, since it is smaller than the sum of its proper divisors (95256522).

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

81648414 is a wasteful number, since it uses less digits than its factorization.

81648414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536031 (or 4536028 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 81648414 is about 9035.9511950873. The cubic root of 81648414 is about 433.8263407946.

The spelling of 81648414 in words is "eighty-one million, six hundred forty-eight thousand, four hundred fourteen".