64821444 has 12 divisors (see below), whose sum is σ = 151250064. Its totient is φ = 21607144.

The previous prime is 64821443. The next prime is 64821457. The reversal of 64821444 is 44412846.

64821444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (64821443) 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, 2700882 + ... + 2700905.

It is an arithmetic number, because the mean of its divisors is an integer number (12604172).

Almost surely, 2^64821444 is an apocalyptic number.

It is an amenable number.

64821444 is an abundant number, since it is smaller than the sum of its proper divisors (86428620).

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

64821444 is a wasteful number, since it uses less digits than its factorization.

64821444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5401794 (or 5401792 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 64821444 is about 8051.1765599818. The cubic root of 64821444 is about 401.7040717066.

The spelling of 64821444 in words is "sixty-four million, eight hundred twenty-one thousand, four hundred forty-four".