81770027 has 4 divisors (see below), whose sum is σ = 82096056. Its totient is φ = 81444000.

The previous prime is 81770021. The next prime is 81770041. The reversal of 81770027 is 72007718.

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

It is a cyclic number.

It is not a de Polignac number, because 81770027 - 2⁴ = 81770011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81769975 and 81770002.

It is not an unprimeable number, because it can be changed into a prime (81770021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162638 + ... + 163139.

It is an arithmetic number, because the mean of its divisors is an integer number (20524014).

Almost surely, 2^81770027 is an apocalyptic number.

81770027 is a deficient number, since it is larger than the sum of its proper divisors (326029).

81770027 is a wasteful number, since it uses less digits than its factorization.

81770027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326028.

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 81770027 is about 9042.6780878233. The cubic root of 81770027 is about 434.0416246258.

The spelling of 81770027 in words is "eighty-one million, seven hundred seventy thousand, twenty-seven".