668784237 has 16 divisors (see below), whose sum is σ = 973332288. Its totient is φ = 405092480.

The previous prime is 668784227. The next prime is 668784239. The reversal of 668784237 is 732487866.

It is a cyclic number.

It is not a de Polignac number, because 668784237 - 2¹² = 668780141 is a prime.

It is a super-3 number, since 3×668784237³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668784237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668784239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66343 + ... + 75755.

It is an arithmetic number, because the mean of its divisors is an integer number (60833268).

Almost surely, 2^668784237 is an apocalyptic number.

It is an amenable number.

668784237 is a deficient number, since it is larger than the sum of its proper divisors (304548051).

668784237 is a wasteful number, since it uses less digits than its factorization.

668784237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11580.

The product of its digits is 2709504, while the sum is 51.

The square root of 668784237 is about 25860.8630366428. The cubic root of 668784237 is about 874.5044211923.

The spelling of 668784237 in words is "six hundred sixty-eight million, seven hundred eighty-four thousand, two hundred thirty-seven".