64381219 has 4 divisors (see below), whose sum is σ = 73578544. Its totient is φ = 55183896.

The previous prime is 64381217. The next prime is 64381223. The reversal of 64381219 is 91218346.

64381219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 64381219 - 2¹ = 64381217 is a prime.

It is a super-2 number, since 2×64381219² = 8289882719851922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64381217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4598652 + ... + 4598665.

It is an arithmetic number, because the mean of its divisors is an integer number (18394636).

Almost surely, 2^64381219 is an apocalyptic number.

64381219 is a deficient number, since it is larger than the sum of its proper divisors (9197325).

64381219 is an equidigital number, since it uses as much as digits as its factorization.

64381219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9197324.

The product of its digits is 10368, while the sum is 34.

The square root of 64381219 is about 8023.7908123280. The cubic root of 64381219 is about 400.7926345387.

The spelling of 64381219 in words is "sixty-four million, three hundred eighty-one thousand, two hundred nineteen".