68933779920 has 400 divisors, whose sum is σ = 260162158080. Its totient is φ = 16852147200.

The previous prime is 68933779919. The next prime is 68933779997. The reversal of 68933779920 is 2997733986.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3807690 + ... + 3825750.

Almost surely, 2^68933779920 is an apocalyptic number.

68933779920 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 68933779920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130081079040).

68933779920 is an abundant number, since it is smaller than the sum of its proper divisors (191228378160).

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

68933779920 is a wasteful number, since it uses less digits than its factorization.

68933779920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18136 (or 18121 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 63.

The spelling of 68933779920 in words is "sixty-eight billion, nine hundred thirty-three million, seven hundred seventy-nine thousand, nine hundred twenty".