81688083 has 8 divisors (see below), whose sum is σ = 109227408. Its totient is φ = 54303744.

The previous prime is 81688081. The next prime is 81688091. The reversal of 81688083 is 38088618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81688083 - 2¹ = 81688081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81688081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37510 + ... + 39627.

It is an arithmetic number, because the mean of its divisors is an integer number (13653426).

Almost surely, 2^81688083 is an apocalyptic number.

81688083 is a deficient number, since it is larger than the sum of its proper divisors (27539325).

81688083 is a wasteful number, since it uses less digits than its factorization.

81688083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77493.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 81688083 is about 9038.1459935100. The cubic root of 81688083 is about 433.8965878043.

The spelling of 81688083 in words is "eighty-one million, six hundred eighty-eight thousand, eighty-three".