74507321 has 4 divisors (see below), whose sum is σ = 85151232. Its totient is φ = 63863412.

The previous prime is 74507309. The next prime is 74507359. The reversal of 74507321 is 12370547.

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 74507321 - 2¹⁸ = 74245177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74507221) 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, 5321945 + ... + 5321958.

It is an arithmetic number, because the mean of its divisors is an integer number (21287808).

Almost surely, 2^74507321 is an apocalyptic number.

It is an amenable number.

74507321 is a deficient number, since it is larger than the sum of its proper divisors (10643911).

74507321 is a wasteful number, since it uses less digits than its factorization.

74507321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643910.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 74507321 is about 8631.7623345410. The cubic root of 74507321 is about 420.7908775347.

Adding to 74507321 its reverse (12370547), we get a palindrome (86877868).

The spelling of 74507321 in words is "seventy-four million, five hundred seven thousand, three hundred twenty-one".