188668 has 12 divisors (see below), whose sum is σ = 334152. Its totient is φ = 93200.

The previous prime is 188653. The next prime is 188677. The reversal of 188668 is 866881.

It is a super-2 number, since 2×188668² = 71191228448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

188668 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 3 ways as a sum of consecutive naturals, for example, 171 + ... + 637.

It is an arithmetic number, because the mean of its divisors is an integer number (27846).

2¹⁸⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

188668 is a deficient number, since it is larger than the sum of its proper divisors (145484).

188668 is a wasteful number, since it uses less digits than its factorization.

188668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 570 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 188668 is about 434.3592982774. The cubic root of 188668 is about 57.3543129759.

Multiplying 188668 by its sum of digits (37), we get a triangular number (6980716 = T₃₇₃₆).

Subtracting from 188668 its product of digits (18432), we obtain a triangular number (170236 = T₅₈₃).

The spelling of 188668 in words is "one hundred eighty-eight thousand, six hundred sixty-eight".