75721673 has 2 divisors, whose sum is σ = 75721674. Its totient is φ = 75721672.

The previous prime is 75721661. The next prime is 75721691. The reversal of 75721673 is 37612757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 327184 = 8683^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 75721673 - 2¹⁰ = 75720649 is a prime.

It is not a weakly prime, because it can be changed into another prime (75721643) 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, 37860836 + 37860837.

It is an arithmetic number, because the mean of its divisors is an integer number (37860837).

Almost surely, 2^75721673 is an apocalyptic number.

It is an amenable number.

75721673 is a deficient number, since it is larger than the sum of its proper divisors (1).

75721673 is an equidigital number, since it uses as much as digits as its factorization.

75721673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 38.

The square root of 75721673 is about 8701.8200969682. The cubic root of 75721673 is about 423.0646451881.

The spelling of 75721673 in words is "seventy-five million, seven hundred twenty-one thousand, six hundred seventy-three".