74545221 has 8 divisors (see below), whose sum is σ = 105240384. Its totient is φ = 46773440.

The previous prime is 74545217. The next prime is 74545223. The reversal of 74545221 is 12254547.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74545221 - 2² = 74545217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74545223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730785 + ... + 730886.

It is an arithmetic number, because the mean of its divisors is an integer number (13155048).

Almost surely, 2^74545221 is an apocalyptic number.

It is an amenable number.

74545221 is a deficient number, since it is larger than the sum of its proper divisors (30695163).

74545221 is a wasteful number, since it uses less digits than its factorization.

74545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461691.

The product of its digits is 11200, while the sum is 30.

The square root of 74545221 is about 8633.9574356143. The cubic root of 74545221 is about 420.8622140186.

Adding to 74545221 its reverse (12254547), we get a palindrome (86799768).

The spelling of 74545221 in words is "seventy-four million, five hundred forty-five thousand, two hundred twenty-one".