68721520432 has 40 divisors (see below), whose sum is σ = 140546361600. Its totient is φ = 32461572672.

The previous prime is 68721520421. The next prime is 68721520459. The reversal of 68721520432 is 23402512786.

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 7 ways as a sum of consecutive naturals, for example, 205708 + ... + 423979.

It is an arithmetic number, because the mean of its divisors is an integer number (3513659040).

Almost surely, 2^68721520432 is an apocalyptic number.

It is an amenable number.

68721520432 is an abundant number, since it is smaller than the sum of its proper divisors (71824841168).

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

68721520432 is a wasteful number, since it uses less digits than its factorization.

68721520432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630073 (or 630067 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 68721520432 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred twenty thousand, four hundred thirty-two".