666252 has 48 divisors (see below), whose sum is σ = 1792000. Its totient is φ = 213840.

The previous prime is 666233. The next prime is 666269. The reversal of 666252 is 252666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

666252 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 15 ways as a sum of consecutive naturals, for example, 3249 + ... + 3447.

2⁶⁶⁶²⁵² is an apocalyptic number.

666252 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896000).

666252 is an abundant number, since it is smaller than the sum of its proper divisors (1125748).

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

666252 is a wasteful number, since it uses less digits than its factorization.

666252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 235 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 666252 is about 816.2426109926. The cubic root of 666252 is about 87.3399304821.

The spelling of 666252 in words is "six hundred sixty-six thousand, two hundred fifty-two".