68328681840 has 80 divisors (see below), whose sum is σ = 235354356000. Its totient is φ = 18220981248.

The previous prime is 68328681823. The next prime is 68328681887. The reversal of 68328681840 is 4818682386.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15814665 + ... + 15818984.

It is an arithmetic number, because the mean of its divisors is an integer number (2941929450).

Almost surely, 2^68328681840 is an apocalyptic number.

68328681840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68328681840 is an abundant number, since it is smaller than the sum of its proper divisors (167025674160).

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

68328681840 is a wasteful number, since it uses less digits than its factorization.

68328681840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31633671 (or 31633659 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 68328681840 in words is "sixty-eight billion, three hundred twenty-eight million, six hundred eighty-one thousand, eight hundred forty".