81322616 has 8 divisors (see below), whose sum is σ = 152479920. Its totient is φ = 40661304.

The previous prime is 81322613. The next prime is 81322651. The reversal of 81322616 is 61622318.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81322616² = 13226735746166912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81322613) by changing a digit.

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 as a sum of consecutive naturals, namely, 5082656 + ... + 5082671.

It is an arithmetic number, because the mean of its divisors is an integer number (19059990).

Almost surely, 2^81322616 is an apocalyptic number.

It is an amenable number.

81322616 is a deficient number, since it is larger than the sum of its proper divisors (71157304).

81322616 is a wasteful number, since it uses less digits than its factorization.

81322616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10165333 (or 10165329 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 81322616 is about 9017.9053000129. The cubic root of 81322616 is about 433.2485456729.

The spelling of 81322616 in words is "eighty-one million, three hundred twenty-two thousand, six hundred sixteen".