668368140 has 48 divisors (see below), whose sum is σ = 2041562880. Its totient is φ = 162028480.

The previous prime is 668368139. The next prime is 668368147. The reversal of 668368140 is 41863866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 668368092 and 668368101.

It is not an unprimeable number, because it can be changed into a prime (668368147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505680 + ... + 506999.

It is an arithmetic number, because the mean of its divisors is an integer number (42532560).

Almost surely, 2^668368140 is an apocalyptic number.

668368140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668368140 is an abundant number, since it is smaller than the sum of its proper divisors (1373194740).

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

668368140 is a wasteful number, since it uses less digits than its factorization.

668368140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012702 (or 1012700 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 668368140 is about 25852.8168677999. The cubic root of 668368140 is about 874.3230203075.

The spelling of 668368140 in words is "six hundred sixty-eight million, three hundred sixty-eight thousand, one hundred forty".