71728319 has 8 divisors (see below), whose sum is σ = 77528640. Its totient is φ = 65968416.

The previous prime is 71728301. The next prime is 71728333. The reversal of 71728319 is 91382717.

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 71728319 - 2¹² = 71724223 is a prime.

It is a super-2 number, since 2×71728319² = 10289903493131522, 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 (71728379) 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, 6359 + ... + 13560.

It is an arithmetic number, because the mean of its divisors is an integer number (9691080).

Almost surely, 2^71728319 is an apocalyptic number.

71728319 is a deficient number, since it is larger than the sum of its proper divisors (5800321).

71728319 is a wasteful number, since it uses less digits than its factorization.

71728319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20209.

The product of its digits is 21168, while the sum is 38.

The square root of 71728319 is about 8469.2572873895. The cubic root of 71728319 is about 415.4928465141.

The spelling of 71728319 in words is "seventy-one million, seven hundred twenty-eight thousand, three hundred nineteen".