68891550784 has 189 divisors, whose sum is σ = 164317793157. Its totient is φ = 28573751808.

The previous prime is 68891550779. The next prime is 68891550787. The reversal of 68891550784 is 48705519886.

The square root of 68891550784 is 262472.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 48017080384 + 20874470400 = 219128^2 + 144480^2 .

It is not an unprimeable number, because it can be changed into a prime (68891550787) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 632032522 + ... + 632032630.

It is an arithmetic number, because the mean of its divisors is an integer number (869406313).

Almost surely, 2^68891550784 is an apocalyptic number.

68891550784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

68891550784 is the 262472-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68891550784

68891550784 is an abundant number, since it is smaller than the sum of its proper divisors (95426242373).

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

68891550784 is an equidigital number, since it uses as much as digits as its factorization.

68891550784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 61.

The spelling of 68891550784 in words is "sixty-eight billion, eight hundred ninety-one million, five hundred fifty thousand, seven hundred eighty-four".