64217944 has 32 divisors (see below), whose sum is σ = 137901600. Its totient is φ = 27463680.

The previous prime is 64217917. The next prime is 64217947. The reversal of 64217944 is 44971246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64217947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35002 + ... + 36790.

It is an arithmetic number, because the mean of its divisors is an integer number (4309425).

Almost surely, 2^64217944 is an apocalyptic number.

It is an amenable number.

64217944 is an abundant number, since it is smaller than the sum of its proper divisors (73683656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64217944 is a wasteful number, since it uses less digits than its factorization.

64217944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443 (or 2439 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 64217944 is about 8013.6099231245. The cubic root of 64217944 is about 400.4535355694.

It can be divided in two parts, 6421 and 7944, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 64217944 in words is "sixty-four million, two hundred seventeen thousand, nine hundred forty-four".