64465889 has 2 divisors, whose sum is σ = 64465890. Its totient is φ = 64465888.

The previous prime is 64465883. The next prime is 64465931. The reversal of 64465889 is 98856446.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64272289 + 193600 = 8017^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 64465889 - 2⁸ = 64465633 is a prime.

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 (64465883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32232944 + 32232945.

It is an arithmetic number, because the mean of its divisors is an integer number (32232945).

Almost surely, 2^64465889 is an apocalyptic number.

It is an amenable number.

64465889 is a deficient number, since it is larger than the sum of its proper divisors (1).

64465889 is an equidigital number, since it uses as much as digits as its factorization.

64465889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 50.

The square root of 64465889 is about 8029.0652631549. The cubic root of 64465889 is about 400.9682563911.

The spelling of 64465889 in words is "sixty-four million, four hundred sixty-five thousand, eight hundred eighty-nine".