668632242 has 16 divisors (see below), whose sum is σ = 1380402432. Its totient is φ = 215687760.

The previous prime is 668632231. The next prime is 668632243. The reversal of 668632242 is 242236866.

668632242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 668632242.

It is not an unprimeable number, because it can be changed into a prime (668632243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1797213 + ... + 1797584.

It is an arithmetic number, because the mean of its divisors is an integer number (86275152).

Almost surely, 2^668632242 is an apocalyptic number.

668632242 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

668632242 is an abundant number, since it is smaller than the sum of its proper divisors (711770190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668632242 is a wasteful number, since it uses less digits than its factorization.

668632242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3594833.

The product of its digits is 165888, while the sum is 39.

The square root of 668632242 is about 25857.9241626237. The cubic root of 668632242 is about 874.4381664557.

The spelling of 668632242 in words is "six hundred sixty-eight million, six hundred thirty-two thousand, two hundred forty-two".