63444640 has 96 divisors (see below), whose sum is σ = 176045184. Its totient is φ = 21150720.

The previous prime is 63444637. The next prime is 63444683. The reversal of 63444640 is 4644436.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40675 + ... + 42205.

It is an arithmetic number, because the mean of its divisors is an integer number (1833804).

Almost surely, 2^63444640 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 63444640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88022592).

63444640 is an abundant number, since it is smaller than the sum of its proper divisors (112600544).

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

63444640 is a wasteful number, since it uses less digits than its factorization.

63444640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 63444640 is about 7965.2143725075. The cubic root of 63444640 is about 398.8396371501.

The spelling of 63444640 in words is "sixty-three million, four hundred forty-four thousand, six hundred forty".