64218449 has 4 divisors (see below), whose sum is σ = 64237236. Its totient is φ = 64199664.

The previous prime is 64218433. The next prime is 64218463. The reversal of 64218449 is 94481246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32092225 + 32126224 = 5665^2 + 5668^2 .

It is a cyclic number.

It is not a de Polignac number, because 64218449 - 2⁴ = 64218433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64218149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2654 + ... + 11639.

It is an arithmetic number, because the mean of its divisors is an integer number (16059309).

Almost surely, 2^64218449 is an apocalyptic number.

It is an amenable number.

64218449 is a deficient number, since it is larger than the sum of its proper divisors (18787).

64218449 is a wasteful number, since it uses less digits than its factorization.

64218449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18786.

The product of its digits is 55296, while the sum is 38.

The square root of 64218449 is about 8013.6414319584. The cubic root of 64218449 is about 400.4545852682.

It can be divided in two parts, 64218 and 449, that multiplied together give a palindrome (28833882).

The spelling of 64218449 in words is "sixty-four million, two hundred eighteen thousand, four hundred forty-nine".