68491438080 has 768 divisors, whose sum is σ = 249646924800. Its totient is φ = 15917383680.

The previous prime is 68491438061. The next prime is 68491438087. The reversal of 68491438080 is 8083419486.

It is a tau number, because it is divible by the number of its divisors (768).

It is not an unprimeable number, because it can be changed into a prime (68491438087) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 769566676 + ... + 769566764.

It is an arithmetic number, because the mean of its divisors is an integer number (325061100).

Almost surely, 2^68491438080 is an apocalyptic number.

68491438080 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 68491438080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124823462400).

68491438080 is an abundant number, since it is smaller than the sum of its proper divisors (181155486720).

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

68491438080 is a wasteful number, since it uses less digits than its factorization.

68491438080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The spelling of 68491438080 in words is "sixty-eight billion, four hundred ninety-one million, four hundred thirty-eight thousand, eighty".