81368710 has 16 divisors (see below), whose sum is σ = 152832096. Its totient is φ = 31132288.

The previous prime is 81368699. The next prime is 81368711. The reversal of 81368710 is 1786318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81368711) 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 in 7 ways as a sum of consecutive naturals, for example, 176659 + ... + 177118.

It is an arithmetic number, because the mean of its divisors is an integer number (9552006).

Almost surely, 2^81368710 is an apocalyptic number.

81368710 is a deficient number, since it is larger than the sum of its proper divisors (71463386).

81368710 is a wasteful number, since it uses less digits than its factorization.

81368710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353807.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81368710 is about 9020.4606312538. The cubic root of 81368710 is about 433.3303859103.

The spelling of 81368710 in words is "eighty-one million, three hundred sixty-eight thousand, seven hundred ten".