74215445 has 4 divisors (see below), whose sum is σ = 89058540. Its totient is φ = 59372352.

The previous prime is 74215439. The next prime is 74215447. The reversal of 74215445 is 54451247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54451247 = 431 ⋅126337.

It can be written as a sum of positive squares in 2 ways, for example, as 49434961 + 24780484 = 7031^2 + 4978^2 .

It is a cyclic number.

It is not a de Polignac number, because 74215445 - 2⁸ = 74215189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74215447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7421540 + ... + 7421549.

It is an arithmetic number, because the mean of its divisors is an integer number (22264635).

Almost surely, 2^74215445 is an apocalyptic number.

It is an amenable number.

74215445 is a deficient number, since it is larger than the sum of its proper divisors (14843095).

74215445 is a wasteful number, since it uses less digits than its factorization.

74215445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14843094.

The product of its digits is 22400, while the sum is 32.

The square root of 74215445 is about 8614.8386520004. The cubic root of 74215445 is about 420.2406878183.

The spelling of 74215445 in words is "seventy-four million, two hundred fifteen thousand, four hundred forty-five".