68648813 has 4 divisors (see below), whose sum is σ = 71633568. Its totient is φ = 65664060.

The previous prime is 68648761. The next prime is 68648869. The reversal of 68648813 is 31884686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31884686 = 2 ⋅15942343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68648813 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 (68648113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492343 + ... + 1492388.

It is an arithmetic number, because the mean of its divisors is an integer number (17908392).

Almost surely, 2^68648813 is an apocalyptic number.

It is an amenable number.

68648813 is a deficient number, since it is larger than the sum of its proper divisors (2984755).

68648813 is a wasteful number, since it uses less digits than its factorization.

68648813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984754.

The product of its digits is 221184, while the sum is 44.

The square root of 68648813 is about 8285.4579233739. The cubic root of 68648813 is about 409.4595556203.

The spelling of 68648813 in words is "sixty-eight million, six hundred forty-eight thousand, eight hundred thirteen".