63447940872 has 240 divisors, whose sum is σ = 190236473460. Its totient is φ = 19751952384.

The previous prime is 63447940849. The next prime is 63447940877. The reversal of 63447940872 is 27804974436.

63447940872 is a `hidden beast` number, since 63 + 4 + 479 + 40 + 8 + 72 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 57252047076 + 6195893796 = 239274^2 + 78714^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (63447940877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 25655028 + ... + 25657500.

Almost surely, 2^63447940872 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 63447940872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95118236730).

63447940872 is an abundant number, since it is smaller than the sum of its proper divisors (126788532588).

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

63447940872 is a wasteful number, since it uses less digits than its factorization.

63447940872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662 (or 2632 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 63447940872 in words is "sixty-three billion, four hundred forty-seven million, nine hundred forty thousand, eight hundred seventy-two".