74645 has 4 divisors (see below), whose sum is σ = 89580. Its totient is φ = 59712.

The previous prime is 74623. The next prime is 74653. The reversal of 74645 is 54647.

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 47089 + 27556 = 217^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 74645 - 2¹² = 70549 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7460 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (22395).

2⁷⁴⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

74645 is a deficient number, since it is larger than the sum of its proper divisors (14935).

74645 is a wasteful number, since it uses less digits than its factorization.

74645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934.

The product of its digits is 3360, while the sum is 26.

The square root of 74645 is about 273.2123716086. The cubic root of 74645 is about 42.1049905410.

The spelling of 74645 in words is "seventy-four thousand, six hundred forty-five".