68317520 has 20 divisors (see below), whose sum is σ = 158838420. Its totient is φ = 27326976.

The previous prime is 68317507. The next prime is 68317537. The reversal of 68317520 is 2571386.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49168144 + 19149376 = 7012^2 + 4376^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426905 + ... + 427064.

It is an arithmetic number, because the mean of its divisors is an integer number (7941921).

Almost surely, 2^68317520 is an apocalyptic number.

It is an amenable number.

68317520 is an abundant number, since it is smaller than the sum of its proper divisors (90520900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68317520 is a wasteful number, since it uses less digits than its factorization.

68317520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853982 (or 853976 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 68317520 is about 8265.4413070326. The cubic root of 68317520 is about 408.7998215386.

The spelling of 68317520 in words is "sixty-eight million, three hundred seventeen thousand, five hundred twenty".