81708486 has 16 divisors (see below), whose sum is σ = 169052400. Its totient is φ = 26296928.

The previous prime is 81708479. The next prime is 81708491. The reversal of 81708486 is 68480718.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234621 + ... + 234968.

It is an arithmetic number, because the mean of its divisors is an integer number (10565775).

Almost surely, 2^81708486 is an apocalyptic number.

81708486 is an abundant number, since it is smaller than the sum of its proper divisors (87343914).

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

81708486 is a wasteful number, since it uses less digits than its factorization.

81708486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469623.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 81708486 is about 9039.2746390405. The cubic root of 81708486 is about 433.9327091691.

The spelling of 81708486 in words is "eighty-one million, seven hundred eight thousand, four hundred eighty-six".