81329366 has 8 divisors (see below), whose sum is σ = 122676120. Its totient is φ = 40437328.

The previous prime is 81329327. The next prime is 81329371. The reversal of 81329366 is 66392318.

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

It is a super-2 number, since 2×81329366² = 13228931547923912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113231 + ... + 113946.

It is an arithmetic number, because the mean of its divisors is an integer number (15334515).

Almost surely, 2^81329366 is an apocalyptic number.

81329366 is a deficient number, since it is larger than the sum of its proper divisors (41346754).

81329366 is a wasteful number, since it uses less digits than its factorization.

81329366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227358.

The product of its digits is 46656, while the sum is 38.

The square root of 81329366 is about 9018.2795476743. The cubic root of 81329366 is about 433.2605322801.

The spelling of 81329366 in words is "eighty-one million, three hundred twenty-nine thousand, three hundred sixty-six".