68991247 has 8 divisors (see below), whose sum is σ = 74367440. Its totient is φ = 63624960.

The previous prime is 68991239. The next prime is 68991257. The reversal of 68991247 is 74219986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68991247 - 2³ = 68991239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68991197 and 68991206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68991257) 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 7 ways as a sum of consecutive naturals, for example, 18847 + ... + 22207.

It is an arithmetic number, because the mean of its divisors is an integer number (9295930).

Almost surely, 2^68991247 is an apocalyptic number.

68991247 is a deficient number, since it is larger than the sum of its proper divisors (5376193).

68991247 is a wasteful number, since it uses less digits than its factorization.

68991247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953.

The product of its digits is 217728, while the sum is 46.

The square root of 68991247 is about 8306.0969775220. The cubic root of 68991247 is about 410.1392487554.

The spelling of 68991247 in words is "sixty-eight million, nine hundred ninety-one thousand, two hundred forty-seven".