64428673 has 2 divisors, whose sum is σ = 64428674. Its totient is φ = 64428672.

The previous prime is 64428647. The next prime is 64428703. The reversal of 64428673 is 37682446.

It is a happy number.

64428673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56655729 + 7772944 = 7527^2 + 2788^2 .

It is a cyclic number.

It is not a de Polignac number, because 64428673 - 2⁵ = 64428641 is a prime.

It is not a weakly prime, because it can be changed into another prime (64428173) 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, 32214336 + 32214337.

It is an arithmetic number, because the mean of its divisors is an integer number (32214337).

Almost surely, 2^64428673 is an apocalyptic number.

It is an amenable number.

64428673 is a deficient number, since it is larger than the sum of its proper divisors (1).

64428673 is an equidigital number, since it uses as much as digits as its factorization.

64428673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 40.

The square root of 64428673 is about 8026.7473487086. The cubic root of 64428673 is about 400.8910822072.

The spelling of 64428673 in words is "sixty-four million, four hundred twenty-eight thousand, six hundred seventy-three".