63440256 has 128 divisors (see below), whose sum is σ = 192119040. Its totient is φ = 18360320.

The previous prime is 63440249. The next prime is 63440261. The reversal of 63440256 is 65204436.

It is a tau number, because it is divible by the number of its divisors (128).

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, 96826 + ... + 97478.

It is an arithmetic number, because the mean of its divisors is an integer number (1500930).

Almost surely, 2^63440256 is an apocalyptic number.

63440256 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63440256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96059520).

63440256 is an abundant number, since it is smaller than the sum of its proper divisors (128678784).

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

63440256 is a wasteful number, since it uses less digits than its factorization.

63440256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 63440256 is about 7964.9391711425. The cubic root of 63440256 is about 398.8304503837.

The spelling of 63440256 in words is "sixty-three million, four hundred forty thousand, two hundred fifty-six".