63440440 has 64 divisors (see below), whose sum is σ = 170242560. Its totient is φ = 20803200.

The previous prime is 63440401. The next prime is 63440471. The reversal of 63440440 is 4404436.

It is a happy number.

It is a congruent number.

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, 1515 + ... + 11365.

It is an arithmetic number, because the mean of its divisors is an integer number (2660040).

Almost surely, 2^63440440 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 63440440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85121280).

63440440 is an abundant number, since it is smaller than the sum of its proper divisors (106802120).

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

63440440 is a wasteful number, since it uses less digits than its factorization.

63440440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9892 (or 9888 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 63440440 is about 7964.9507217559. The cubic root of 63440440 is about 398.8308359682.

Adding to 63440440 its reverse (4404436), we get a palindrome (67844876).

The spelling of 63440440 in words is "sixty-three million, four hundred forty thousand, four hundred forty".