71728771 has 2 divisors, whose sum is σ = 71728772. Its totient is φ = 71728770.

The previous prime is 71728759. The next prime is 71728777. The reversal of 71728771 is 17782717.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71728771 - 2²¹ = 69631619 is a prime.

It is not a weakly prime, because it can be changed into another prime (71728777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35864385 + 35864386.

It is an arithmetic number, because the mean of its divisors is an integer number (35864386).

Almost surely, 2^71728771 is an apocalyptic number.

71728771 is a deficient number, since it is larger than the sum of its proper divisors (1).

71728771 is an equidigital number, since it uses as much as digits as its factorization.

71728771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38416, while the sum is 40.

The square root of 71728771 is about 8469.2839720959. The cubic root of 71728771 is about 415.4937192627.

The spelling of 71728771 in words is "seventy-one million, seven hundred twenty-eight thousand, seven hundred seventy-one".