67138851328 has 40 divisors (see below), whose sum is σ = 134841830508. Its totient is φ = 33395441664.

The previous prime is 67138851323. The next prime is 67138851443. The reversal of 67138851328 is 82315883176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66911203584 + 227647744 = 258672^2 + 15088^2 .

It is not an unprimeable number, because it can be changed into a prime (67138851323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240901 + ... + 438532.

Almost surely, 2^67138851328 is an apocalyptic number.

It is an amenable number.

67138851328 is an abundant number, since it is smaller than the sum of its proper divisors (67702979180).

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

67138851328 is an equidigital number, since it uses as much as digits as its factorization.

67138851328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679644 (or 679628 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 67138851328 in words is "sixty-seven billion, one hundred thirty-eight million, eight hundred fifty-one thousand, three hundred twenty-eight".