64644289 has 4 divisors (see below), whose sum is σ = 68046640. Its totient is φ = 61241940.

The previous prime is 64644287. The next prime is 64644299. The reversal of 64644289 is 98244646.

64644289 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64644289 - 2¹ = 64644287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64644287) 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, 1701147 + ... + 1701184.

It is an arithmetic number, because the mean of its divisors is an integer number (17011660).

Almost surely, 2^64644289 is an apocalyptic number.

It is an amenable number.

64644289 is a deficient number, since it is larger than the sum of its proper divisors (3402351).

64644289 is a wasteful number, since it uses less digits than its factorization.

64644289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402350.

The product of its digits is 331776, while the sum is 43.

The square root of 64644289 is about 8040.1672246291. The cubic root of 64644289 is about 401.3377895598.

The spelling of 64644289 in words is "sixty-four million, six hundred forty-four thousand, two hundred eighty-nine".