68088639844 has 9 divisors (see below), whose sum is σ = 119156033017. Its totient is φ = 34044058984.

The previous prime is 68088639841. The next prime is 68088639851. The reversal of 68088639844 is 44893688086.

The square root of 68088639844 is 260938.

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., 37379582244 + 30709057600 = 193338^2 + 175240^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68088639841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 456642 + ... + 587110.

Almost surely, 2^68088639844 is an apocalyptic number.

68088639844 is the 260938-th square number.

It is an amenable number.

68088639844 is a deficient number, since it is larger than the sum of its proper divisors (51067393173).

68088639844 is an frugal number, since it uses more digits than its factorization.

68088639844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260942 (or 130471 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 64.

Multiplying 68088639844 by its sum of digits (64), we get a square (4357672950016 = 2087504²).

The spelling of 68088639844 in words is "sixty-eight billion, eighty-eight million, six hundred thirty-nine thousand, eight hundred forty-four".