81686035 has 8 divisors (see below), whose sum is σ = 103182480. Its totient is φ = 61909344.

The previous prime is 81686029. The next prime is 81686039. The reversal of 81686035 is 53068618.

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

It is a cyclic number.

It is not a de Polignac number, because 81686035 - 2⁹ = 81685523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81685985 and 81686003.

It is not an unprimeable number, because it can be changed into a prime (81686039) 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, 429832 + ... + 430021.

It is an arithmetic number, because the mean of its divisors is an integer number (12897810).

Almost surely, 2^81686035 is an apocalyptic number.

81686035 is a deficient number, since it is larger than the sum of its proper divisors (21496445).

81686035 is a wasteful number, since it uses less digits than its factorization.

81686035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859877.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 81686035 is about 9038.0326952274. The cubic root of 81686035 is about 433.8929617036.

The spelling of 81686035 in words is "eighty-one million, six hundred eighty-six thousand, thirty-five".