68420447 has 4 divisors (see below), whose sum is σ = 68437320. Its totient is φ = 68403576.

The previous prime is 68420413. The next prime is 68420449. The reversal of 68420447 is 74402486.

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 68420447 - 2¹⁶ = 68354911 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 (68420449) 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, 1733 + ... + 11825.

It is an arithmetic number, because the mean of its divisors is an integer number (17109330).

Almost surely, 2^68420447 is an apocalyptic number.

68420447 is a deficient number, since it is larger than the sum of its proper divisors (16873).

68420447 is a wasteful number, since it uses less digits than its factorization.

68420447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16872.

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 68420447 is about 8271.6653099603. The cubic root of 68420447 is about 409.0050174439.

The spelling of 68420447 in words is "sixty-eight million, four hundred twenty thousand, four hundred forty-seven".