68782813 has 6 divisors (see below), whose sum is σ = 75604382. Its totient is φ = 62529720.

The previous prime is 68782787. The next prime is 68782829. The reversal of 68782813 is 31828786.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68608089 + 174724 = 8283^2 + 418^2 .

It is not a de Polignac number, because 68782813 - 2¹³ = 68774621 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 68782813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68782873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284106 + ... + 284347.

Almost surely, 2^68782813 is an apocalyptic number.

It is an amenable number.

68782813 is a deficient number, since it is larger than the sum of its proper divisors (6821569).

68782813 is a wasteful number, since it uses less digits than its factorization.

68782813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568475 (or 568464 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 68782813 is about 8293.5404381965. The cubic root of 68782813 is about 409.7257992103.

The spelling of 68782813 in words is "sixty-eight million, seven hundred eighty-two thousand, eight hundred thirteen".