71728775 has 12 divisors (see below), whose sum is σ = 89537424. Its totient is φ = 57000000.

The previous prime is 71728771. The next prime is 71728777. The reversal of 71728775 is 57782717.

It is not a de Polignac number, because 71728775 - 2² = 71728771 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 (71728771) 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, 5726 + ... + 13275.

It is an arithmetic number, because the mean of its divisors is an integer number (7461452).

Almost surely, 2^71728775 is an apocalyptic number.

71728775 is a deficient number, since it is larger than the sum of its proper divisors (17808649).

71728775 is a wasteful number, since it uses less digits than its factorization.

71728775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19162 (or 19157 counting only the distinct ones).

The product of its digits is 192080, while the sum is 44.

The square root of 71728775 is about 8469.2842082433. The cubic root of 71728775 is about 415.4937269861.

It can be divided in two parts, 717 and 28775, that added together give a palindrome (29492).

The spelling of 71728775 in words is "seventy-one million, seven hundred twenty-eight thousand, seven hundred seventy-five".