68986736640 has 208 divisors, whose sum is σ = 245258198400. Its totient is φ = 18396315648.

The previous prime is 68986736617. The next prime is 68986736647. The reversal of 68986736640 is 4663768986.

It is not an unprimeable number, because it can be changed into a prime (68986736647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490581 + ... + 615339.

Almost surely, 2^68986736640 is an apocalyptic number.

68986736640 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 68986736640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122629099200).

68986736640 is an abundant number, since it is smaller than the sum of its proper divisors (176271461760).

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

68986736640 is a wasteful number, since it uses less digits than its factorization.

68986736640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124797 (or 124769 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 63.

The spelling of 68986736640 in words is "sixty-eight billion, nine hundred eighty-six million, seven hundred thirty-six thousand, six hundred forty".