68521713 has 32 divisors (see below), whose sum is σ = 104936832. Its totient is φ = 39398400.

The previous prime is 68521709. The next prime is 68521721. The reversal of 68521713 is 31712586.

It is not a de Polignac number, because 68521713 - 2² = 68521709 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68521703) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 119718 + ... + 120288.

It is an arithmetic number, because the mean of its divisors is an integer number (3279276).

Almost surely, 2^68521713 is an apocalyptic number.

It is an amenable number.

68521713 is a deficient number, since it is larger than the sum of its proper divisors (36415119).

68521713 is a wasteful number, since it uses less digits than its factorization.

68521713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785.

The product of its digits is 10080, while the sum is 33.

The square root of 68521713 is about 8277.7843049937. The cubic root of 68521713 is about 409.2067012335.

It can be divided in two parts, 6852 and 1713, that multiplied together give a square (11737476 = 3426²).

The spelling of 68521713 in words is "sixty-eight million, five hundred twenty-one thousand, seven hundred thirteen".