68543777280 has 640 divisors, whose sum is σ = 249011490816. Its totient is φ = 15939993600.

The previous prime is 68543777279. The next prime is 68543777293. The reversal of 68543777280 is 8277734586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a self number, because there is not a number n which added to its sum of digits gives 68543777280.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 242204019 + ... + 242204301.

Almost surely, 2^68543777280 is an apocalyptic number.

68543777280 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 68543777280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124505745408).

68543777280 is an abundant number, since it is smaller than the sum of its proper divisors (180467713536).

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

68543777280 is a wasteful number, since it uses less digits than its factorization.

68543777280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 57.

The spelling of 68543777280 in words is "sixty-eight billion, five hundred forty-three million, seven hundred seventy-seven thousand, two hundred eighty".