71728745 has 16 divisors (see below), whose sum is σ = 97139520. Its totient is φ = 50366400.

The previous prime is 71728733. The next prime is 71728751. The reversal of 71728745 is 54782717.

It is not a de Polignac number, because 71728745 - 2¹⁶ = 71663209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20891 + ... + 24080.

It is an arithmetic number, because the mean of its divisors is an integer number (6071220).

Almost surely, 2^71728745 is an apocalyptic number.

It is an amenable number.

71728745 is a deficient number, since it is larger than the sum of its proper divisors (25410775).

71728745 is a wasteful number, since it uses less digits than its factorization.

71728745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45016.

The product of its digits is 109760, while the sum is 41.

The square root of 71728745 is about 8469.2824371372. The cubic root of 71728745 is about 415.4936690604.

The spelling of 71728745 in words is "seventy-one million, seven hundred twenty-eight thousand, seven hundred forty-five".