71728831 has 8 divisors (see below), whose sum is σ = 76038480. Its totient is φ = 67429248.

The previous prime is 71728807. The next prime is 71728843. The reversal of 71728831 is 13882717.

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

It is a cyclic number.

It is not a de Polignac number, because 71728831 - 2⁵ = 71728799 is a prime.

It is a super-2 number, since 2×71728831² = 10290050393253122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71728871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16200 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (9504810).

Almost surely, 2^71728831 is an apocalyptic number.

71728831 is a deficient number, since it is larger than the sum of its proper divisors (4309649).

71728831 is a wasteful number, since it uses less digits than its factorization.

71728831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5033.

The product of its digits is 18816, while the sum is 37.

The square root of 71728831 is about 8469.2875143072. The cubic root of 71728831 is about 415.4938351140.

The spelling of 71728831 in words is "seventy-one million, seven hundred twenty-eight thousand, eight hundred thirty-one".