64440000 has 210 divisors, whose sum is σ = 232097580. Its totient is φ = 17088000.

The previous prime is 64439971. The next prime is 64440011. The reversal of 64440000 is 4446.

64440000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 10.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 359911 + ... + 360089.

Almost surely, 2^64440000 is an apocalyptic number.

64440000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116048790).

64440000 is an abundant number, since it is smaller than the sum of its proper divisors (167657580).

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

64440000 is a wasteful number, since it uses less digits than its factorization.

64440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 64440000 is about 8027.4528961558. The cubic root of 64440000 is about 400.9145739591.

Adding to 64440000 its reverse (4446), we get a palindrome (64444446).

The spelling of 64440000 in words is "sixty-four million, four hundred forty thousand".