68649613 has 4 divisors (see below), whose sum is σ = 68695648. Its totient is φ = 68603580.

The previous prime is 68649601. The next prime is 68649619. The reversal of 68649613 is 31694686.

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: 31694686 = 2 ⋅15847343.

It is a cyclic number.

It is not a de Polignac number, because 68649613 - 2⁹ = 68649101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68649613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68649619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20703 + ... + 23788.

It is an arithmetic number, because the mean of its divisors is an integer number (17173912).

Almost surely, 2^68649613 is an apocalyptic number.

It is an amenable number.

68649613 is a deficient number, since it is larger than the sum of its proper divisors (46035).

68649613 is a wasteful number, since it uses less digits than its factorization.

68649613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46034.

The product of its digits is 186624, while the sum is 43.

The square root of 68649613 is about 8285.5062005891. The cubic root of 68649613 is about 409.4611461618.

The spelling of 68649613 in words is "sixty-eight million, six hundred forty-nine thousand, six hundred thirteen".