81827455 has 4 divisors (see below), whose sum is σ = 98192952. Its totient is φ = 65461960.

The previous prime is 81827441. The next prime is 81827479. The reversal of 81827455 is 55472818.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81827455 - 2⁷ = 81827327 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 8182741 + ... + 8182750.

It is an arithmetic number, because the mean of its divisors is an integer number (24548238).

Almost surely, 2^81827455 is an apocalyptic number.

81827455 is a deficient number, since it is larger than the sum of its proper divisors (16365497).

81827455 is a wasteful number, since it uses less digits than its factorization.

81827455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16365496.

The product of its digits is 89600, while the sum is 40.

The square root of 81827455 is about 9045.8529172212. The cubic root of 81827455 is about 434.1432116022.

The spelling of 81827455 in words is "eighty-one million, eight hundred twenty-seven thousand, four hundred fifty-five".