538668 has 36 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 165600.

The previous prime is 538651. The next prime is 538697. The reversal of 538668 is 866835.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

538668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108 + ... + 1043.

It is an arithmetic number, because the mean of its divisors is an integer number (40768).

2⁵³⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 538668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733824).

538668 is an abundant number, since it is smaller than the sum of its proper divisors (928980).

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

538668 is a wasteful number, since it uses less digits than its factorization.

538668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174 (or 1169 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 538668 is about 733.9400520478. The cubic root of 538668 is about 81.3655177353.

The spelling of 538668 in words is "five hundred thirty-eight thousand, six hundred sixty-eight".