68783251 has 4 divisors (see below), whose sum is σ = 69414400. Its totient is φ = 68152104.

The previous prime is 68783227. The next prime is 68783263. The reversal of 68783251 is 15238786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15238786 = 2 ⋅7619393.

It is a cyclic number.

It is not a de Polignac number, because 68783251 - 2⁵ = 68783219 is a prime.

It is a super-2 number, since 2×68783251² = 9462271236258002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68703251) 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, 315411 + ... + 315628.

It is an arithmetic number, because the mean of its divisors is an integer number (17353600).

Almost surely, 2^68783251 is an apocalyptic number.

68783251 is a deficient number, since it is larger than the sum of its proper divisors (631149).

68783251 is a wasteful number, since it uses less digits than its factorization.

68783251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631148.

The product of its digits is 80640, while the sum is 40.

The square root of 68783251 is about 8293.5668442474. The cubic root of 68783251 is about 409.7266689020.

It can be divided in two parts, 687 and 83251, that added together give a palindrome (83938).

The spelling of 68783251 in words is "sixty-eight million, seven hundred eighty-three thousand, two hundred fifty-one".