74304721 has 2 divisors, whose sum is σ = 74304722. Its totient is φ = 74304720.

The previous prime is 74304719. The next prime is 74304749. The reversal of 74304721 is 12740347.

It is an a-pointer prime, because the next prime (74304749) can be obtained adding 74304721 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60279696 + 14025025 = 7764^2 + 3745^2 .

It is an emirp because it is prime and its reverse (12740347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74304721 - 2¹ = 74304719 is a prime.

Together with 74304719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 74304721.

It is not a weakly prime, because it can be changed into another prime (74304761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37152360 + 37152361.

It is an arithmetic number, because the mean of its divisors is an integer number (37152361).

Almost surely, 2^74304721 is an apocalyptic number.

It is an amenable number.

74304721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74304721 is an equidigital number, since it uses as much as digits as its factorization.

74304721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 74304721 is about 8620.0186194694. The cubic root of 74304721 is about 420.4091270342.

The spelling of 74304721 in words is "seventy-four million, three hundred four thousand, seven hundred twenty-one".