64649969 has 2 divisors, whose sum is σ = 64649970. Its totient is φ = 64649968.

The previous prime is 64649947. The next prime is 64650011. The reversal of 64649969 is 96994646.

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., 38588944 + 26061025 = 6212^2 + 5105^2 .

It is a cyclic number.

It is not a de Polignac number, because 64649969 - 2⁸ = 64649713 is a prime.

It is a super-2 number, since 2×64649969² = 8359236983401922, which contains 22 as substring.

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 64649969.

It is not a weakly prime, because it can be changed into another prime (64649939) 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, 32324984 + 32324985.

It is an arithmetic number, because the mean of its divisors is an integer number (32324985).

Almost surely, 2^64649969 is an apocalyptic number.

It is an amenable number.

64649969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64649969 is an equidigital number, since it uses as much as digits as its factorization.

64649969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 53.

The square root of 64649969 is about 8040.5204433544. The cubic root of 64649969 is about 401.3495437916.

The spelling of 64649969 in words is "sixty-four million, six hundred forty-nine thousand, nine hundred sixty-nine".