64884689 has 2 divisors, whose sum is σ = 64884690. Its totient is φ = 64884688.

The previous prime is 64884661. The next prime is 64884709. The reversal of 64884689 is 98648846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 14190289 = 7120^2 + 3767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64884689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64884689.

It is not a weakly prime, because it can be changed into another prime (64884289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32442344 + 32442345.

It is an arithmetic number, because the mean of its divisors is an integer number (32442345).

Almost surely, 2^64884689 is an apocalyptic number.

It is an amenable number.

64884689 is a deficient number, since it is larger than the sum of its proper divisors (1).

64884689 is an equidigital number, since it uses as much as digits as its factorization.

64884689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 53.

The square root of 64884689 is about 8055.1032892198. The cubic root of 64884689 is about 401.8346741445.

The spelling of 64884689 in words is "sixty-four million, eight hundred eighty-four thousand, six hundred eighty-nine".