668140220 has 36 divisors (see below), whose sum is σ = 1542249912. Its totient is φ = 242959200.

The previous prime is 668140211. The next prime is 668140279. The reversal of 668140220 is 22041866.

668140220 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 2×668140220² = 892822707163296800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135626 + ... + 140465.

Almost surely, 2^668140220 is an apocalyptic number.

It is an amenable number.

668140220 is an abundant number, since it is smaller than the sum of its proper divisors (874109692).

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

668140220 is a wasteful number, since it uses less digits than its factorization.

668140220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276122 (or 276109 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 668140220 is about 25848.4084616442. The cubic root of 668140220 is about 874.2236248063.

The spelling of 668140220 in words is "six hundred sixty-eight million, one hundred forty thousand, two hundred twenty".