68211247 has 4 divisors (see below), whose sum is σ = 73458280. Its totient is φ = 62964216.

The previous prime is 68211181. The next prime is 68211289. The reversal of 68211247 is 74211286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68211247 - 2⁷ = 68211119 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 (68215247) 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, 2623497 + ... + 2623522.

It is an arithmetic number, because the mean of its divisors is an integer number (18364570).

Almost surely, 2^68211247 is an apocalyptic number.

68211247 is a deficient number, since it is larger than the sum of its proper divisors (5247033).

68211247 is a wasteful number, since it uses less digits than its factorization.

68211247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5247032.

The product of its digits is 5376, while the sum is 31.

The square root of 68211247 is about 8259.0100496367. The cubic root of 68211247 is about 408.5877386550.

The spelling of 68211247 in words is "sixty-eight million, two hundred eleven thousand, two hundred forty-seven".