81330016 has 12 divisors (see below), whose sum is σ = 160118532. Its totient is φ = 40664992.

The previous prime is 81329993. The next prime is 81330017. The reversal of 81330016 is 61003318.

It is a super-2 number, since 2×81330016² = 13229143005120512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81330017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270750 + ... + 1270813.

It is an arithmetic number, because the mean of its divisors is an integer number (13343211).

Almost surely, 2^81330016 is an apocalyptic number.

It is an amenable number.

81330016 is a deficient number, since it is larger than the sum of its proper divisors (78788516).

81330016 is a wasteful number, since it uses less digits than its factorization.

81330016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541573 (or 2541565 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 81330016 is about 9018.3155855182. The cubic root of 81330016 is about 433.2616865110.

The spelling of 81330016 in words is "eighty-one million, three hundred thirty thousand, sixteen".