81686702 has 8 divisors (see below), whose sum is σ = 122572656. Its totient is φ = 40829152.

The previous prime is 81686701. The next prime is 81686729. The reversal of 81686702 is 20768618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81686701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2918 + ... + 13110.

It is an arithmetic number, because the mean of its divisors is an integer number (15321582).

Almost surely, 2^81686702 is an apocalyptic number.

81686702 is a deficient number, since it is larger than the sum of its proper divisors (40885954).

81686702 is a wasteful number, since it uses less digits than its factorization.

81686702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14202.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81686702 is about 9038.0695947752. The cubic root of 81686702 is about 433.8941426718.

The spelling of 81686702 in words is "eighty-one million, six hundred eighty-six thousand, seven hundred two".