81616067 has 8 divisors (see below), whose sum is σ = 88749024. Its totient is φ = 74605248.

The previous prime is 81616061. The next prime is 81616097. The reversal of 81616067 is 76061618.

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 81616067 - 2¹⁰ = 81615043 is a prime.

It is a super-3 number, since 3×81616067³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (81616061) 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, 29138 + ... + 31815.

It is an arithmetic number, because the mean of its divisors is an integer number (11093628).

Almost surely, 2^81616067 is an apocalyptic number.

81616067 is a deficient number, since it is larger than the sum of its proper divisors (7132957).

81616067 is a wasteful number, since it uses less digits than its factorization.

81616067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61069.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 81616067 is about 9034.1611121343. The cubic root of 81616067 is about 433.7690429508.

The spelling of 81616067 in words is "eighty-one million, six hundred sixteen thousand, sixty-seven".