81740455 has 8 divisors (see below), whose sum is σ = 98200800. Its totient is φ = 65317536.

The previous prime is 81740453. The next prime is 81740467. The reversal of 81740455 is 55404718.

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

It is a cyclic number.

It is not a de Polignac number, because 81740455 - 2¹ = 81740453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81740455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81740453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4300 + ... + 13489.

It is an arithmetic number, because the mean of its divisors is an integer number (12275100).

Almost surely, 2^81740455 is an apocalyptic number.

81740455 is a deficient number, since it is larger than the sum of its proper divisors (16460345).

81740455 is a wasteful number, since it uses less digits than its factorization.

81740455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18713.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 81740455 is about 9041.0428048981. The cubic root of 81740455 is about 433.9892948296.

The spelling of 81740455 in words is "eighty-one million, seven hundred forty thousand, four hundred fifty-five".