68591996928 has 936 divisors, whose sum is σ = 261038389248. Its totient is φ = 17167417344.

The previous prime is 68591996927. The next prime is 68591996939. The reversal of 68591996928 is 82969919586.

68591996928 is a `hidden beast` number, since 6 + 8 + 591 + 9 + 9 + 6 + 9 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (936).

It is a super-2 number, since 2×68591996928² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68591996923) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 540094401 + ... + 540094527.

It is an arithmetic number, because the mean of its divisors is an integer number (278887168).

Almost surely, 2^68591996928 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 68591996928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130519194624).

68591996928 is an abundant number, since it is smaller than the sum of its proper divisors (192446392320).

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

68591996928 is a wasteful number, since it uses less digits than its factorization.

68591996928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 175 counting only the distinct ones).

The product of its digits is 151165440, while the sum is 72.

The spelling of 68591996928 in words is "sixty-eight billion, five hundred ninety-one million, nine hundred ninety-six thousand, nine hundred twenty-eight".