64631444 has 12 divisors (see below), whose sum is σ = 114376500. Its totient is φ = 31952448.

The previous prime is 64631431. The next prime is 64631447. The reversal of 64631444 is 44413646.

64631444 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 10048900 + 54582544 = 3170^2 + 7388^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64631444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64631447) 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, 90419 + ... + 91130.

It is an arithmetic number, because the mean of its divisors is an integer number (9531375).

Almost surely, 2^64631444 is an apocalyptic number.

It is an amenable number.

64631444 is a deficient number, since it is larger than the sum of its proper divisors (49745056).

64631444 is a wasteful number, since it uses less digits than its factorization.

64631444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181642 (or 181640 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 64631444 is about 8039.3683831505. The cubic root of 64631444 is about 401.3112054873.

The spelling of 64631444 in words is "sixty-four million, six hundred thirty-one thousand, four hundred forty-four".