68449521 has 12 divisors (see below), whose sum is σ = 106166832. Its totient is φ = 39113928.

The previous prime is 68449489. The next prime is 68449523. The reversal of 68449521 is 12594486.

It is not a de Polignac number, because 68449521 - 2⁵ = 68449489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68449521.

It is not an unprimeable number, because it can be changed into a prime (68449523) 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, 232675 + ... + 232968.

It is an arithmetic number, because the mean of its divisors is an integer number (8847236).

Almost surely, 2^68449521 is an apocalyptic number.

It is an amenable number.

68449521 is a deficient number, since it is larger than the sum of its proper divisors (37717311).

68449521 is a wasteful number, since it uses less digits than its factorization.

68449521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465660 (or 465653 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 68449521 is about 8273.4225686834. The cubic root of 68449521 is about 409.0629422722.

It can be divided in two parts, 684 and 49521, that added together give a palindrome (50205).

The spelling of 68449521 in words is "sixty-eight million, four hundred forty-nine thousand, five hundred twenty-one".