68680313 has 4 divisors (see below), whose sum is σ = 73963428. Its totient is φ = 63397200.

The previous prime is 68680291. The next prime is 68680319. The reversal of 68680313 is 31308686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31308686 = 2 ⋅15654343.

It can be written as a sum of positive squares in 2 ways, for example, as 3523129 + 65157184 = 1877^2 + 8072^2 .

It is a cyclic number.

It is not a de Polignac number, because 68680313 - 2¹² = 68676217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68680319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2641538 + ... + 2641563.

It is an arithmetic number, because the mean of its divisors is an integer number (18490857).

Almost surely, 2^68680313 is an apocalyptic number.

It is an amenable number.

68680313 is a deficient number, since it is larger than the sum of its proper divisors (5283115).

68680313 is a wasteful number, since it uses less digits than its factorization.

68680313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283114.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 68680313 is about 8287.3586262452. The cubic root of 68680313 is about 409.5221738612.

Adding to 68680313 its reverse (31308686), we get a palindrome (99988999).

The spelling of 68680313 in words is "sixty-eight million, six hundred eighty thousand, three hundred thirteen".