68605421 has 12 divisors (see below), whose sum is σ = 73226868. Its totient is φ = 64261632.

The previous prime is 68605367. The next prime is 68605429. The reversal of 68605421 is 12450686.

It can be written as a sum of positive squares in 6 ways, for example, as 9084196 + 59521225 = 3014^2 + 7715^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68605421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68605429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79625 + ... + 80481.

It is an arithmetic number, because the mean of its divisors is an integer number (6102239).

Almost surely, 2^68605421 is an apocalyptic number.

It is an amenable number.

68605421 is a deficient number, since it is larger than the sum of its proper divisors (4621447).

68605421 is a wasteful number, since it uses less digits than its factorization.

68605421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 1151 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 68605421 is about 8282.8389456756. The cubic root of 68605421 is about 409.3732661271.

The spelling of 68605421 in words is "sixty-eight million, six hundred five thousand, four hundred twenty-one".