66128 has 10 divisors (see below), whose sum is σ = 128154. Its totient is φ = 33056.

The previous prime is 66109. The next prime is 66137. The reversal of 66128 is 82166.

It can be written as a sum of positive squares in only one way, i.e., 61504 + 4624 = 248^2 + 68^2 .

It is a congruent number.

It is an unprimeable number.

66128 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 as a sum of consecutive naturals, namely, 2051 + ... + 2082.

2⁶⁶¹²⁸ is an apocalyptic number.

It is an amenable number.

66128 is a deficient number, since it is larger than the sum of its proper divisors (62026).

66128 is a wasteful number, since it uses less digits than its factorization.

66128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141 (or 4135 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 66128 is about 257.1536505671. The cubic root of 66128 is about 40.4385085234.

It can be divided in two parts, 66 and 128, that multiplied together give a palindrome (8448).

The spelling of 66128 in words is "sixty-six thousand, one hundred twenty-eight".