71728911 has 12 divisors (see below), whose sum is σ = 103682592. Its totient is φ = 47785056.

The previous prime is 71728879. The next prime is 71728913. The reversal of 71728911 is 11982717.

It is not a de Polignac number, because 71728911 - 2⁵ = 71728879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71728913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20395 + ... + 23651.

It is an arithmetic number, because the mean of its divisors is an integer number (8640216).

Almost surely, 2^71728911 is an apocalyptic number.

71728911 is a deficient number, since it is larger than the sum of its proper divisors (31953681).

71728911 is a wasteful number, since it uses less digits than its factorization.

71728911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710 (or 5707 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 71728911 is about 8469.2922372534. The cubic root of 71728911 is about 415.4939895823.

The spelling of 71728911 in words is "seventy-one million, seven hundred twenty-eight thousand, nine hundred eleven".