668742850 has 24 divisors (see below), whose sum is σ = 1283989248. Its totient is φ = 258867600.

The previous prime is 668742827. The next prime is 668742857. The reversal of 668742850 is 58247866.

668742850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×668742850² = 894433998852245000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668742850.

It is not an unprimeable number, because it can be changed into a prime (668742857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214174 + ... + 217273.

It is an arithmetic number, because the mean of its divisors is an integer number (53499552).

Almost surely, 2^668742850 is an apocalyptic number.

668742850 is a deficient number, since it is larger than the sum of its proper divisors (615246398).

668742850 is a wasteful number, since it uses less digits than its factorization.

668742850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431490 (or 431485 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 668742850 is about 25860.0628382841. The cubic root of 668742850 is about 874.4863815620.

The spelling of 668742850 in words is "six hundred sixty-eight million, seven hundred forty-two thousand, eight hundred fifty".