75729 has 4 divisors (see below), whose sum is σ = 100976. Its totient is φ = 50484.

The previous prime is 75721. The next prime is 75731. The reversal of 75729 is 92757.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 75729 - 2³ = 75721 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75696 and 75705.

It is not an unprimeable number, because it can be changed into a prime (75721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12619 + ... + 12624.

It is an arithmetic number, because the mean of its divisors is an integer number (25244).

2⁷⁵⁷²⁹ is an apocalyptic number.

It is an amenable number.

75729 is a deficient number, since it is larger than the sum of its proper divisors (25247).

75729 is a wasteful number, since it uses less digits than its factorization.

75729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25246.

The product of its digits is 4410, while the sum is 30.

The square root of 75729 is about 275.1890259440. The cubic root of 75729 is about 42.3078290311.

The spelling of 75729 in words is "seventy-five thousand, seven hundred twenty-nine".