74744221 has 4 divisors (see below), whose sum is σ = 75135744. Its totient is φ = 74352700.

The previous prime is 74744213. The next prime is 74744237. The reversal of 74744221 is 12244747.

It is the 3530-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74744221 - 2³ = 74744213 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74744251) 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, 195475 + ... + 195856.

It is an arithmetic number, because the mean of its divisors is an integer number (18783936).

Almost surely, 2^74744221 is an apocalyptic number.

It is an amenable number.

74744221 is a deficient number, since it is larger than the sum of its proper divisors (391523).

74744221 is a wasteful number, since it uses less digits than its factorization.

74744221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391522.

The product of its digits is 12544, while the sum is 31.

The square root of 74744221 is about 8645.4740182364. The cubic root of 74744221 is about 421.2363813775.

Adding to 74744221 its reverse (12244747), we get a palindrome (86988968).

The spelling of 74744221 in words is "seventy-four million, seven hundred forty-four thousand, two hundred twenty-one".