63904481280 has 544 divisors, whose sum is σ = 235550315520. Its totient is φ = 16420700160.

The previous prime is 63904481273. The next prime is 63904481281. The reversal of 63904481280 is 8218440936.

It is a happy number.

63904481280 is a `hidden beast` number, since 6 + 3 + 90 + 4 + 481 + 2 + 80 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (63904481281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274268044 + ... + 274268276.

Almost surely, 2^63904481280 is an apocalyptic number.

63904481280 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 63904481280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117775157760).

63904481280 is an abundant number, since it is smaller than the sum of its proper divisors (171645834240).

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

63904481280 is an equidigital number, since it uses as much as digits as its factorization.

63904481280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 63904481280 in words is "sixty-three billion, nine hundred four million, four hundred eighty-one thousand, two hundred eighty".