64128073 has 2 divisors, whose sum is σ = 64128074. Its totient is φ = 64128072.

The previous prime is 64128049. The next prime is 64128089. The reversal of 64128073 is 37082146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64128064 + 9 = 8008^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 64128073 - 2¹⁷ = 63997001 is a prime.

It is a super-2 number, since 2×64128073² = 8224819493386658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64128973) 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, 32064036 + 32064037.

It is an arithmetic number, because the mean of its divisors is an integer number (32064037).

Almost surely, 2^64128073 is an apocalyptic number.

It is an amenable number.

64128073 is a deficient number, since it is larger than the sum of its proper divisors (1).

64128073 is an equidigital number, since it uses as much as digits as its factorization.

64128073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 64128073 is about 8008.0005619380. Note that the first 3 decimals coincide. The cubic root of 64128073 is about 400.2666409670.

The spelling of 64128073 in words is "sixty-four million, one hundred twenty-eight thousand, seventy-three".