64218438 has 48 divisors (see below), whose sum is σ = 146162016. Its totient is φ = 20338560.

The previous prime is 64218433. The next prime is 64218463. The reversal of 64218438 is 83481246.

64218438 is a `hidden beast` number, since 6 + 4 + 218 + 438 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64218431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74506 + ... + 75362.

It is an arithmetic number, because the mean of its divisors is an integer number (3045042).

Almost surely, 2^64218438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64218438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73081008).

64218438 is an abundant number, since it is smaller than the sum of its proper divisors (81943578).

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

64218438 is a wasteful number, since it uses less digits than its factorization.

64218438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069 (or 1066 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 64218438 is about 8013.6407456287. The cubic root of 64218438 is about 400.4545624035.

The spelling of 64218438 in words is "sixty-four million, two hundred eighteen thousand, four hundred thirty-eight".