71728786 has 8 divisors (see below), whose sum is σ = 108658764. Its totient is φ = 35509200.

The previous prime is 71728777. The next prime is 71728799. The reversal of 71728786 is 68782717.

It can be written as a sum of positive squares in 2 ways, for example, as 65302561 + 6426225 = 8081^2 + 2535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 177345 + ... + 177748.

Almost surely, 2^71728786 is an apocalyptic number.

71728786 is a deficient number, since it is larger than the sum of its proper divisors (36929978).

71728786 is a wasteful number, since it uses less digits than its factorization.

71728786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355196.

The product of its digits is 263424, while the sum is 46.

The square root of 71728786 is about 8469.2848576488. The cubic root of 71728786 is about 415.4937482255.

The spelling of 71728786 in words is "seventy-one million, seven hundred twenty-eight thousand, seven hundred eighty-six".