74233721 has 4 divisors (see below), whose sum is σ = 74256000. Its totient is φ = 74211444.

The previous prime is 74233697. The next prime is 74233723. The reversal of 74233721 is 12733247.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12733247 = 41 ⋅310567.

It is a cyclic number.

It is not a de Polignac number, because 74233721 - 2¹⁸ = 73971577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74233723) 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, 5021 + ... + 13178.

It is an arithmetic number, because the mean of its divisors is an integer number (18564000).

Almost surely, 2^74233721 is an apocalyptic number.

It is an amenable number.

74233721 is a deficient number, since it is larger than the sum of its proper divisors (22279).

74233721 is a wasteful number, since it uses less digits than its factorization.

74233721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22278.

The product of its digits is 7056, while the sum is 29.

The square root of 74233721 is about 8615.8993146392. The cubic root of 74233721 is about 420.2751805867.

Adding to 74233721 its reverse (12733247), we get a palindrome (86966968).

The spelling of 74233721 in words is "seventy-four million, two hundred thirty-three thousand, seven hundred twenty-one".