68921447 has 8 divisors (see below), whose sum is σ = 78842016. Its totient is φ = 59019552.

The previous prime is 68921441. The next prime is 68921459. The reversal of 68921447 is 74412986.

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 68921447 - 2²⁴ = 52144231 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 (68921441) 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, 4433 + ... + 12549.

It is an arithmetic number, because the mean of its divisors is an integer number (9855252).

Almost surely, 2^68921447 is an apocalyptic number.

68921447 is a deficient number, since it is larger than the sum of its proper divisors (9920569).

68921447 is a wasteful number, since it uses less digits than its factorization.

68921447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9337.

The product of its digits is 96768, while the sum is 41.

The square root of 68921447 is about 8301.8941814504. The cubic root of 68921447 is about 410.0008863752. Note that the first 3 decimals are identical.

The spelling of 68921447 in words is "sixty-eight million, nine hundred twenty-one thousand, four hundred forty-seven".