71728979 has 8 divisors (see below), whose sum is σ = 82048608. Its totient is φ = 61427520.

The previous prime is 71728963. The next prime is 71728999. The reversal of 71728979 is 97982717.

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

It is not a de Polignac number, because 71728979 - 2⁴ = 71728963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71728939) 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, 5369 + ... + 13125.

It is an arithmetic number, because the mean of its divisors is an integer number (10256076).

Almost surely, 2^71728979 is an apocalyptic number.

71728979 is a deficient number, since it is larger than the sum of its proper divisors (10319629).

71728979 is a wasteful number, since it uses less digits than its factorization.

71728979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9085.

The product of its digits is 444528, while the sum is 50.

The square root of 71728979 is about 8469.2962517555. The cubic root of 71728979 is about 415.4941208803.

The spelling of 71728979 in words is "seventy-one million, seven hundred twenty-eight thousand, nine hundred seventy-nine".