64021444 has 12 divisors (see below), whose sum is σ = 115901100. Its totient is φ = 30906848.

The previous prime is 64021423. The next prime is 64021457. The reversal of 64021444 is 44412046.

64021444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42510400 + 21511044 = 6520^2 + 4638^2 .

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 3 ways as a sum of consecutive naturals, for example, 275839 + ... + 276070.

It is an arithmetic number, because the mean of its divisors is an integer number (9658425).

Almost surely, 2^64021444 is an apocalyptic number.

It is an amenable number.

64021444 is a deficient number, since it is larger than the sum of its proper divisors (51879656).

64021444 is a wasteful number, since it uses less digits than its factorization.

64021444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551942 (or 551940 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 64021444 is about 8001.3401377519. The cubic root of 64021444 is about 400.0446700113.

The spelling of 64021444 in words is "sixty-four million, twenty-one thousand, four hundred forty-four".