81986662 has 8 divisors (see below), whose sum is σ = 123030000. Its totient is φ = 40976664.

The previous prime is 81986657. The next prime is 81986669. The reversal of 81986662 is 26668918.

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 (81986669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837 + ... + 12832.

It is an arithmetic number, because the mean of its divisors is an integer number (15378750).

Almost surely, 2^81986662 is an apocalyptic number.

81986662 is a deficient number, since it is larger than the sum of its proper divisors (41043338).

81986662 is a wasteful number, since it uses less digits than its factorization.

81986662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16670.

The product of its digits is 248832, while the sum is 46.

The square root of 81986662 is about 9054.6486403394. The cubic root of 81986662 is about 434.4245917329.

The spelling of 81986662 in words is "eighty-one million, nine hundred eighty-six thousand, six hundred sixty-two".