634843881984 has 80 divisors (see below), whose sum is σ = 1821361050432. Its totient is φ = 195336572928.

The previous prime is 634843881979. The next prime is 634843881989. The reversal of 634843881984 is 489188348436.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (634843881979) and next prime (634843881989).

It is not an unprimeable number, because it can be changed into a prime (634843881989) 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 7 ways as a sum of consecutive naturals, for example, 15876564 + ... + 15916499.

Almost surely, 2^634843881984 is an apocalyptic number.

634843881984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

634843881984 is an abundant number, since it is smaller than the sum of its proper divisors (1186517168448).

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

634843881984 is a wasteful number, since it uses less digits than its factorization.

634843881984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31793097 (or 31793081 counting only the distinct ones).

The product of its digits is 127401984, while the sum is 66.

The spelling of 634843881984 in words is "six hundred thirty-four billion, eight hundred forty-three million, eight hundred eighty-one thousand, nine hundred eighty-four".