64644032 has 28 divisors (see below), whose sum is σ = 131749800. Its totient is φ = 31447296.

The previous prime is 64644031. The next prime is 64644043. The reversal of 64644032 is 23044646.

It is a happy number.

64644032 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64643986 and 64644004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644031) 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, 11282 + ... + 16017.

It is an arithmetic number, because the mean of its divisors is an integer number (4705350).

Almost surely, 2^64644032 is an apocalyptic number.

It is an amenable number.

64644032 is an abundant number, since it is smaller than the sum of its proper divisors (67105768).

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

64644032 is a wasteful number, since it uses less digits than its factorization.

64644032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27348 (or 27338 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 64644032 is about 8040.1512423586. The cubic root of 64644032 is about 401.3372577059.

Adding to 64644032 its reverse (23044646), we get a palindrome (87688678).

The spelling of 64644032 in words is "sixty-four million, six hundred forty-four thousand, thirty-two".