68131537280 has 64 divisors (see below), whose sum is σ = 163163080080. Its totient is φ = 27204741120.

The previous prime is 68131537193. The next prime is 68131537289. The reversal of 68131537280 is 8273513186.

It is a happy number.

68131537280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68131537289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272222 + ... + 458658.

Almost surely, 2^68131537280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68131537280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81581540040).

68131537280 is an abundant number, since it is smaller than the sum of its proper divisors (95031542800).

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

68131537280 is a wasteful number, since it uses less digits than its factorization.

68131537280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187027 (or 187015 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 68131537280 in words is "sixty-eight billion, one hundred thirty-one million, five hundred thirty-seven thousand, two hundred eighty".