668436 has 24 divisors (see below), whose sum is σ = 1590624. Its totient is φ = 218400.

The previous prime is 668417. The next prime is 668471. The reversal of 668436 is 634866.

It is a junction number, because it is equal to n+sod(n) for n = 668397 and 668406.

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, 111 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (66276).

2⁶⁶⁸⁴³⁶ is an apocalyptic number.

It is an amenable number.

668436 is an abundant number, since it is smaller than the sum of its proper divisors (922188).

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

668436 is a wasteful number, since it uses less digits than its factorization.

668436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1109 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 668436 is about 817.5793539468. The cubic root of 668436 is about 87.4352609566.

The spelling of 668436 in words is "six hundred sixty-eight thousand, four hundred thirty-six".