74670221 has 4 divisors (see below), whose sum is σ = 74696700. Its totient is φ = 74643744.

The previous prime is 74670191. The next prime is 74670229. The reversal of 74670221 is 12207647.

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 36168196 + 38502025 = 6014^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 74670221 - 2¹⁸ = 74408077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74670229) 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, 8426 + ... + 14843.

It is an arithmetic number, because the mean of its divisors is an integer number (18674175).

Almost surely, 2^74670221 is an apocalyptic number.

It is an amenable number.

74670221 is a deficient number, since it is larger than the sum of its proper divisors (26479).

74670221 is a wasteful number, since it uses less digits than its factorization.

74670221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26478.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 74670221 is about 8641.1932625072. The cubic root of 74670221 is about 421.0973214185.

Adding to 74670221 its reverse (12207647), we get a palindrome (86877868).

The spelling of 74670221 in words is "seventy-four million, six hundred seventy thousand, two hundred twenty-one".