64443500 has 48 divisors (see below), whose sum is σ = 153552672. Its totient is φ = 23432000.

The previous prime is 64443487. The next prime is 64443503. The reversal of 64443500 is 534446.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 64443500.

It is not an unprimeable number, because it can be changed into a prime (64443503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359 + ... + 11358.

It is an arithmetic number, because the mean of its divisors is an integer number (3199014).

Almost surely, 2^64443500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64443500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76776336).

64443500 is an abundant number, since it is smaller than the sum of its proper divisors (89109172).

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

64443500 is a wasteful number, since it uses less digits than its factorization.

64443500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11747 (or 11735 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 64443500 is about 8027.6708950978. The cubic root of 64443500 is about 400.9218322645.

Adding to 64443500 its reverse (534446), we get a palindrome (64977946).

It can be divided in two parts, 644 and 43500, that added together give a palindrome (44144).

The spelling of 64443500 in words is "sixty-four million, four hundred forty-three thousand, five hundred".