81216086 has 8 divisors (see below), whose sum is σ = 139227600. Its totient is φ = 34806888.

The previous prime is 81216053. The next prime is 81216097. The reversal of 81216086 is 68061218.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2900561 + ... + 2900588.

It is an arithmetic number, because the mean of its divisors is an integer number (17403450).

Almost surely, 2^81216086 is an apocalyptic number.

81216086 is a deficient number, since it is larger than the sum of its proper divisors (58011514).

81216086 is a wasteful number, since it uses less digits than its factorization.

81216086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801158.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 81216086 is about 9011.9967820678. The cubic root of 81216086 is about 433.0592824727.

The spelling of 81216086 in words is "eighty-one million, two hundred sixteen thousand, eighty-six".