67639712640 has 64 divisors (see below), whose sum is σ = 215601590160. Its totient is φ = 18037256192.

The previous prime is 67639712599. The next prime is 67639712641. The reversal of 67639712640 is 4621793676.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67639712641) 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 7 ways as a sum of consecutive naturals, for example, 17612589 + ... + 17616428.

Almost surely, 2^67639712640 is an apocalyptic number.

67639712640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67639712640 is an abundant number, since it is smaller than the sum of its proper divisors (147961877520).

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

67639712640 is a wasteful number, since it uses less digits than its factorization.

67639712640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35229039 (or 35229027 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 51.

The spelling of 67639712640 in words is "sixty-seven billion, six hundred thirty-nine million, seven hundred twelve thousand, six hundred forty".