64680949 has 2 divisors, whose sum is σ = 64680950. Its totient is φ = 64680948.

The previous prime is 64680947. The next prime is 64680953. The reversal of 64680949 is 94908646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56896849 + 7784100 = 7543^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 64680949 - 2¹ = 64680947 is a prime.

Together with 64680947, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64680899 and 64680908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64680947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32340474 + 32340475.

It is an arithmetic number, because the mean of its divisors is an integer number (32340475).

Almost surely, 2^64680949 is an apocalyptic number.

It is an amenable number.

64680949 is a deficient number, since it is larger than the sum of its proper divisors (1).

64680949 is an equidigital number, since it uses as much as digits as its factorization.

64680949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 64680949 is about 8042.4467048281. The cubic root of 64680949 is about 401.4136419060.

The spelling of 64680949 in words is "sixty-four million, six hundred eighty thousand, nine hundred forty-nine".