67644231940 has 12 divisors (see below), whose sum is σ = 142052887116. Its totient is φ = 27057692768.

The previous prime is 67644231937. The next prime is 67644231953. The reversal of 67644231940 is 4913244676.

It can be written as a sum of positive squares in 2 ways, for example, as 26744023296 + 40900208644 = 163536^2 + 202238^2 .

It is a super-2 number, since 2×67644231940² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1691105779 + ... + 1691105818.

It is an arithmetic number, because the mean of its divisors is an integer number (11837740593).

Almost surely, 2^67644231940 is an apocalyptic number.

It is an amenable number.

67644231940 is an abundant number, since it is smaller than the sum of its proper divisors (74408655176).

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

67644231940 is a wasteful number, since it uses less digits than its factorization.

67644231940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382211606 (or 3382211604 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 67644231940 in words is "sixty-seven billion, six hundred forty-four million, two hundred thirty-one thousand, nine hundred forty".