74445 has 16 divisors (see below), whose sum is σ = 136320. Its totient is φ = 33984.

The previous prime is 74441. The next prime is 74449. The reversal of 74445 is 54447.

74445 = 28² + 29² + ... + 62².

It is an interprime number because it is at equal distance from previous prime (74441) and next prime (74449).

It is not a de Polignac number, because 74445 - 2² = 74441 is a prime.

It is a Curzon number.

74445 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 74445.

It is not an unprimeable number, because it can be changed into a prime (74441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250 + ... + 459.

It is an arithmetic number, because the mean of its divisors is an integer number (8520).

2⁷⁴⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

74445 is a deficient number, since it is larger than the sum of its proper divisors (61875).

74445 is a wasteful number, since it uses less digits than its factorization.

74445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724.

The product of its digits is 2240, while the sum is 24.

The square root of 74445 is about 272.8461104726. The cubic root of 74445 is about 42.0673522520.

The spelling of 74445 in words is "seventy-four thousand, four hundred forty-five".