71728431 has 8 divisors (see below), whose sum is σ = 96515760. Its totient is φ = 47380032.

The previous prime is 71728417. The next prime is 71728463. The reversal of 71728431 is 13482717.

It is a happy number.

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

It is not a de Polignac number, because 71728431 - 2⁵ = 71728399 is a prime.

It is a super-2 number, since 2×71728431² = 10289935627443522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71728392 and 71728401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71728231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109350 + ... + 110003.

It is an arithmetic number, because the mean of its divisors is an integer number (12064470).

Almost surely, 2^71728431 is an apocalyptic number.

71728431 is a deficient number, since it is larger than the sum of its proper divisors (24787329).

71728431 is a wasteful number, since it uses less digits than its factorization.

71728431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219465.

The product of its digits is 9408, while the sum is 33.

The square root of 71728431 is about 8469.2638995370. The cubic root of 71728431 is about 415.4930627707.

The spelling of 71728431 in words is "seventy-one million, seven hundred twenty-eight thousand, four hundred thirty-one".