81534688 has 12 divisors (see below), whose sum is σ = 160521480. Its totient is φ = 40767328.

The previous prime is 81534683. The next prime is 81534731. The reversal of 81534688 is 88643518.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81534683) 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 as a sum of consecutive naturals, namely, 1273948 + ... + 1274011.

It is an arithmetic number, because the mean of its divisors is an integer number (13376790).

Almost surely, 2^81534688 is an apocalyptic number.

It is an amenable number.

81534688 is a deficient number, since it is larger than the sum of its proper divisors (78986792).

81534688 is a wasteful number, since it uses less digits than its factorization.

81534688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547969 (or 2547961 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 81534688 is about 9029.6560288862. The cubic root of 81534688 is about 433.6248253103.

The spelling of 81534688 in words is "eighty-one million, five hundred thirty-four thousand, six hundred eighty-eight".