74433521 has 4 divisors (see below), whose sum is σ = 74595444. Its totient is φ = 74271600.

The previous prime is 74433509. The next prime is 74433547. The reversal of 74433521 is 12533447.

It is a happy number.

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 20205025 + 54228496 = 4495^2 + 7364^2 .

It is a cyclic number.

It is not a de Polignac number, because 74433521 - 2¹⁴ = 74417137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74433551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80270 + ... + 81191.

It is an arithmetic number, because the mean of its divisors is an integer number (18648861).

Almost surely, 2^74433521 is an apocalyptic number.

It is an amenable number.

74433521 is a deficient number, since it is larger than the sum of its proper divisors (161923).

74433521 is a wasteful number, since it uses less digits than its factorization.

74433521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161922.

The product of its digits is 10080, while the sum is 29.

The square root of 74433521 is about 8627.4863662599. The cubic root of 74433521 is about 420.6518995784.

Adding to 74433521 its reverse (12533447), we get a palindrome (86966968).

The spelling of 74433521 in words is "seventy-four million, four hundred thirty-three thousand, five hundred twenty-one".