74566721 has 2 divisors, whose sum is σ = 74566722. Its totient is φ = 74566720.

The previous prime is 74566717. The next prime is 74566727. The reversal of 74566721 is 12766547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50908225 + 23658496 = 7135^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 74566721 - 2² = 74566717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (74566727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37283360 + 37283361.

It is an arithmetic number, because the mean of its divisors is an integer number (37283361).

Almost surely, 2^74566721 is an apocalyptic number.

It is an amenable number.

74566721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74566721 is an equidigital number, since it uses as much as digits as its factorization.

74566721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 74566721 is about 8635.2024295902. The cubic root of 74566721 is about 420.9026711966.

The spelling of 74566721 in words is "seventy-four million, five hundred sixty-six thousand, seven hundred twenty-one".