668380 has 24 divisors (see below), whose sum is σ = 1465632. Its totient is φ = 255552.

The previous prime is 668347. The next prime is 668407. The reversal of 668380 is 83866.

668380 = T₂₁ + T₂₂ + ... + T₁₅₈.

668380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (61068).

2⁶⁶⁸³⁸⁰ is an apocalyptic number.

It is an amenable number.

668380 is an abundant number, since it is smaller than the sum of its proper divisors (797252).

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

668380 is a wasteful number, since it uses less digits than its factorization.

668380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485 (or 1483 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 668380 is about 817.5451057893. The cubic root of 668380 is about 87.4328191814.

It can be divided in two parts, 6 and 68380, that added together give a palindrome (68386).

The spelling of 668380 in words is "six hundred sixty-eight thousand, three hundred eighty".