64128973 has 2 divisors, whose sum is σ = 64128974. Its totient is φ = 64128972.

The previous prime is 64128949. The next prime is 64128989. The reversal of 64128973 is 37982146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35259844 + 28869129 = 5938^2 + 5373^2 .

It is a cyclic number.

It is not a de Polignac number, because 64128973 - 2⁵ = 64128941 is a prime.

It is a super-2 number, since 2×64128973² = 8225050356069458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64128073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32064486 + 32064487.

It is an arithmetic number, because the mean of its divisors is an integer number (32064487).

Almost surely, 2^64128973 is an apocalyptic number.

It is an amenable number.

64128973 is a deficient number, since it is larger than the sum of its proper divisors (1).

64128973 is an equidigital number, since it uses as much as digits as its factorization.

64128973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 64128973 is about 8008.0567555431. The cubic root of 64128973 is about 400.2685134610.

The spelling of 64128973 in words is "sixty-four million, one hundred twenty-eight thousand, nine hundred seventy-three".