71725729 has 4 divisors (see below), whose sum is σ = 74199060. Its totient is φ = 69252400.

The previous prime is 71725681. The next prime is 71725739. The reversal of 71725729 is 92752717.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17305600 + 54420129 = 4160^2 + 7377^2 .

It is a cyclic number.

It is not a de Polignac number, because 71725729 - 2⁹ = 71725217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71725691 and 71725700.

It is not an unprimeable number, because it can be changed into a prime (71725739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1236622 + ... + 1236679.

It is an arithmetic number, because the mean of its divisors is an integer number (18549765).

Almost surely, 2^71725729 is an apocalyptic number.

It is an amenable number.

71725729 is a deficient number, since it is larger than the sum of its proper divisors (2473331).

71725729 is a wasteful number, since it uses less digits than its factorization.

71725729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473330.

The product of its digits is 61740, while the sum is 40.

The square root of 71725729 is about 8469.1043800392. The cubic root of 71725729 is about 415.4878455166.

The spelling of 71725729 in words is "seventy-one million, seven hundred twenty-five thousand, seven hundred twenty-nine".