74068721 has 2 divisors, whose sum is σ = 74068722. Its totient is φ = 74068720.

The previous prime is 74068637. The next prime is 74068727. The reversal of 74068721 is 12786047.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 19678096 = 7375^2 + 4436^2 .

It is a cyclic number.

It is not a de Polignac number, because 74068721 - 2²² = 69874417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74068727) 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, 37034360 + 37034361.

It is an arithmetic number, because the mean of its divisors is an integer number (37034361).

Almost surely, 2^74068721 is an apocalyptic number.

It is an amenable number.

74068721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74068721 is an equidigital number, since it uses as much as digits as its factorization.

74068721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 74068721 is about 8606.3186671189. The cubic root of 74068721 is about 419.9635663785.

The spelling of 74068721 in words is "seventy-four million, sixty-eight thousand, seven hundred twenty-one".