67644078084 has 72 divisors (see below), whose sum is σ = 196351253280. Its totient is φ = 19419350400.

The previous prime is 67644078071. The next prime is 67644078109. The reversal of 67644078084 is 48087044676.

It is a super-2 number, since 2×67644078084² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67644078084.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4487697 + ... + 4502744.

It is an arithmetic number, because the mean of its divisors is an integer number (2727100740).

Almost surely, 2^67644078084 is an apocalyptic number.

It is an amenable number.

67644078084 is an abundant number, since it is smaller than the sum of its proper divisors (128707175196).

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

67644078084 is a wasteful number, since it uses less digits than its factorization.

67644078084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990481 (or 8990476 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 54.

The spelling of 67644078084 in words is "sixty-seven billion, six hundred forty-four million, seventy-eight thousand, eighty-four".