81927306 has 12 divisors (see below), whose sum is σ = 177509202. Its totient is φ = 27309096.

The previous prime is 81927299. The next prime is 81927323. The reversal of 81927306 is 60372918.

It can be written as a sum of positive squares in only one way, i.e., 53890281 + 28037025 = 7341^2 + 5295^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2275741 + ... + 2275776.

Almost surely, 2^81927306 is an apocalyptic number.

81927306 is an abundant number, since it is smaller than the sum of its proper divisors (95581896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81927306 is a wasteful number, since it uses less digits than its factorization.

81927306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551525 (or 4551522 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81927306 is about 9051.3703934819. The cubic root of 81927306 is about 434.3197294270.

The spelling of 81927306 in words is "eighty-one million, nine hundred twenty-seven thousand, three hundred six".