81376727 has 4 divisors (see below), whose sum is σ = 83576136. Its totient is φ = 79177320.

The previous prime is 81376717. The next prime is 81376741. The reversal of 81376727 is 72767318.

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 81376727 - 2¹⁰ = 81375703 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 (81376717) 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, 1099649 + ... + 1099722.

It is an arithmetic number, because the mean of its divisors is an integer number (20894034).

Almost surely, 2^81376727 is an apocalyptic number.

81376727 is a deficient number, since it is larger than the sum of its proper divisors (2199409).

81376727 is a wasteful number, since it uses less digits than its factorization.

81376727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199408.

The product of its digits is 98784, while the sum is 41.

The square root of 81376727 is about 9020.9049989455. The cubic root of 81376727 is about 433.3446169974.

The spelling of 81376727 in words is "eighty-one million, three hundred seventy-six thousand, seven hundred twenty-seven".