72745 has 4 divisors (see below), whose sum is σ = 87300.
Its totient is φ = 58192.
The previous prime is 72739. The next prime is 72763. The reversal of 72745 is 54727.
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 44521 + 28224 = 211^2 + 168^2
It is a cyclic number.
It is not a de Polignac number, because 72745 - 27 = 72617 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7270 + ... + 7279.
It is an arithmetic number, because the mean of its divisors is an integer number (21825).
272745 is an apocalyptic number.
It is an amenable number.
72745 is a deficient number, since it is larger than the sum of its proper divisors (14555).
72745 is a wasteful number, since it uses less digits than its factorization.
72745 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 14554.
The product of its digits is 1960, while the sum is 25.
The square root of 72745 is about 269.7128102260.
The cubic root of 72745 is about 41.7446716520.
The spelling of 72745 in words is "seventy-two thousand, seven hundred forty-five".