74544721 has 2 divisors, whose sum is σ = 74544722. Its totient is φ = 74544720.

The previous prime is 74544719. The next prime is 74544793. The reversal of 74544721 is 12744547.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73017025 + 1527696 = 8545^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 74544721 - 2¹ = 74544719 is a prime.

Together with 74544719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (74547721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37272360 + 37272361.

It is an arithmetic number, because the mean of its divisors is an integer number (37272361).

Almost surely, 2^74544721 is an apocalyptic number.

It is an amenable number.

74544721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74544721 is an equidigital number, since it uses as much as digits as its factorization.

74544721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 34.

The square root of 74544721 is about 8633.9284801300. The cubic root of 74544721 is about 420.8612730614.

The spelling of 74544721 in words is "seventy-four million, five hundred forty-four thousand, seven hundred twenty-one".