81407727 has 16 divisors (see below), whose sum is σ = 124764000. Its totient is φ = 52399872.

The previous prime is 81407707. The next prime is 81407743. The reversal of 81407727 is 72770418.

It is not a de Polignac number, because 81407727 - 2⁶ = 81407663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81407691 and 81407700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81407707) 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 15 ways as a sum of consecutive naturals, for example, 51202 + ... + 52767.

It is an arithmetic number, because the mean of its divisors is an integer number (7797750).

Almost surely, 2^81407727 is an apocalyptic number.

81407727 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

81407727 is a deficient number, since it is larger than the sum of its proper divisors (43356273).

81407727 is a wasteful number, since it uses less digits than its factorization.

81407727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104007 (or 104001 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 81407727 is about 9022.6230664924. The cubic root of 81407727 is about 433.3996367316.

The spelling of 81407727 in words is "eighty-one million, four hundred seven thousand, seven hundred twenty-seven".