81740045 has 16 divisors (see below), whose sum is σ = 104291712. Its totient is φ = 61364160.

The previous prime is 81740041. The next prime is 81740053. The reversal of 81740045 is 54004718.

It is not a de Polignac number, because 81740045 - 2² = 81740041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81740041) 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 15 ways as a sum of consecutive naturals, for example, 611 + ... + 12800.

It is an arithmetic number, because the mean of its divisors is an integer number (6518232).

Almost surely, 2^81740045 is an apocalyptic number.

It is an amenable number.

81740045 is a deficient number, since it is larger than the sum of its proper divisors (22551667).

81740045 is a wasteful number, since it uses less digits than its factorization.

81740045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13492.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 81740045 is about 9041.0201304941. The cubic root of 81740045 is about 433.9885692162.

The spelling of 81740045 in words is "eighty-one million, seven hundred forty thousand, forty-five".