68493393920 has 240 divisors, whose sum is σ = 193972251648. Its totient is φ = 22720020480.

The previous prime is 68493393803. The next prime is 68493393937. The reversal of 68493393920 is 2939339486.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17774714 + ... + 17778566.

Almost surely, 2^68493393920 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 68493393920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96986125824).

68493393920 is an abundant number, since it is smaller than the sum of its proper divisors (125478857728).

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

68493393920 is an equidigital number, since it uses as much as digits as its factorization.

68493393920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924 (or 3898 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 56.

The spelling of 68493393920 in words is "sixty-eight billion, four hundred ninety-three million, three hundred ninety-three thousand, nine hundred twenty".