74908721 has 2 divisors, whose sum is σ = 74908722. Its totient is φ = 74908720.

The previous prime is 74908693. The next prime is 74908733. The reversal of 74908721 is 12780947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65788321 + 9120400 = 8111^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 74908721 - 2⁶ = 74908657 is a prime.

It is a super-2 number, since 2×74908721² = 11222632963711682, which contains 22 as substring.

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 (74908781) 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, 37454360 + 37454361.

It is an arithmetic number, because the mean of its divisors is an integer number (37454361).

Almost surely, 2^74908721 is an apocalyptic number.

It is an amenable number.

74908721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74908721 is an equidigital number, since it uses as much as digits as its factorization.

74908721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 74908721 is about 8654.9824378794. The cubic root of 74908721 is about 421.5451794418.

The spelling of 74908721 in words is "seventy-four million, nine hundred eight thousand, seven hundred twenty-one".