68721573904 has 15 divisors (see below), whose sum is σ = 133150081117. Its totient is φ = 34360262656.

The previous prime is 68721573887. The next prime is 68721573931. The reversal of 68721573904 is 40937512786.

The square root of 68721573904 is 262148.

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., 68717379600 + 4194304 = 262140^2 + 2048^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1015824 + ... + 1081360.

It is a 1-persistent number, because it is pandigital, but 2⋅68721573904 = 137443147808 is not.

Almost surely, 2^68721573904 is an apocalyptic number.

68721573904 is the 262148-th square number.

It is an amenable number.

68721573904 is a deficient number, since it is larger than the sum of its proper divisors (64428507213).

68721573904 is an frugal number, since it uses more digits than its factorization.

68721573904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131082 (or 65539 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 68721573904 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred seventy-three thousand, nine hundred four".