74565 has 12 divisors (see below), whose sum is σ = 129324. Its totient is φ = 39744.

The previous prime is 74561. The next prime is 74567. The reversal of 74565 is 56547.

74565 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 25281 + 49284 = 159^2 + 222^2 .

It is not a de Polignac number, because 74565 - 2² = 74561 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74561) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 784 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (10777).

2⁷⁴⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

74565 is a deficient number, since it is larger than the sum of its proper divisors (54759).

74565 is a wasteful number, since it uses less digits than its factorization.

74565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1665 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 74565 is about 273.0659261058. The cubic root of 74565 is about 42.0899433027.

The spelling of 74565 in words is "seventy-four thousand, five hundred sixty-five".