81272727 has 10 divisors (see below), whose sum is σ = 121407528. Its totient is φ = 54181764.

The previous prime is 81272717. The next prime is 81272771. The reversal of 81272727 is 72727218.

It is not a de Polignac number, because 81272727 - 2⁶ = 81272663 is a prime.

It is an alternating number because its digits alternate between even and odd.

81272727 is a modest number, since divided by 272727 gives 81 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 81272691 and 81272700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272717) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 501603 + ... + 501764.

Almost surely, 2^81272727 is an apocalyptic number.

81272727 is a deficient number, since it is larger than the sum of its proper divisors (40134801).

81272727 is a wasteful number, since it uses less digits than its factorization.

81272727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003379 (or 1003370 counting only the distinct ones).

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

The square root of 81272727 is about 9015.1387676508. The cubic root of 81272727 is about 433.1599325286.

The spelling of 81272727 in words is "eighty-one million, two hundred seventy-two thousand, seven hundred twenty-seven".