63440980920 has 256 divisors, whose sum is σ = 216209347200. Its totient is φ = 16540692480.

The previous prime is 63440980913. The next prime is 63440980927. The reversal of 63440980920 is 2908904436.

63440980920 is a `hidden beast` number, since 634 + 4 + 0 + 9 + 8 + 0 + 9 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (63440980913) and next prime (63440980927).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63440980927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17914350 + ... + 17917890.

Almost surely, 2^63440980920 is an apocalyptic number.

63440980920 is a gapful number since it is divisible by the number (60) 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 63440980920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108104673600).

63440980920 is an abundant number, since it is smaller than the sum of its proper divisors (152768366280).

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

63440980920 is a wasteful number, since it uses less digits than its factorization.

63440980920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3927 (or 3917 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 63440980920 in words is "sixty-three billion, four hundred forty million, nine hundred eighty thousand, nine hundred twenty".