67391859840 has 128 divisors (see below), whose sum is σ = 215611761600. Its totient is φ = 17904218112.

The previous prime is 67391859839. The next prime is 67391859841. The reversal of 67391859840 is 4895819376.

It is an interprime number because it is at equal distance from previous prime (67391859839) and next prime (67391859841).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (67391859841) 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 15 ways as a sum of consecutive naturals, for example, 451239 + ... + 581721.

Almost surely, 2^67391859840 is an apocalyptic number.

67391859840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67391859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107805880800).

67391859840 is an abundant number, since it is smaller than the sum of its proper divisors (148219901760).

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

67391859840 is a wasteful number, since it uses less digits than its factorization.

67391859840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130774 (or 130762 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 67391859840 in words is "sixty-seven billion, three hundred ninety-one million, eight hundred fifty-nine thousand, eight hundred forty".