658668 has 24 divisors (see below), whose sum is σ = 1552320. Its totient is φ = 217360.

The previous prime is 658663. The next prime is 658681. The reversal of 658668 is 866856.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 658668.

It is not an unprimeable number, because it can be changed into a prime (658663) by changing a digit.

658668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363 + ... + 1781.

It is an arithmetic number, because the mean of its divisors is an integer number (64680).

2⁶⁵⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

658668 is an abundant number, since it is smaller than the sum of its proper divisors (893652).

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

658668 is a wasteful number, since it uses less digits than its factorization.

658668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 555 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 658668 is about 811.5836370948. The cubic root of 658668 is about 87.0072658749.

It can be divided in two parts, 658 and 668, that added together give a triangular number (1326 = T₅₁).

The spelling of 658668 in words is "six hundred fifty-eight thousand, six hundred sixty-eight".