655128 has 48 divisors (see below), whose sum is σ = 1845480. Its totient is φ = 217728.

The previous prime is 655121. The next prime is 655157. The reversal of 655128 is 821556.

655128 is a `hidden beast` number, since 655 + 1 + 2 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655121) by changing a digit.

655128 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 11 ways as a sum of consecutive naturals, for example, 1776 + ... + 2112.

2⁶⁵⁵¹²⁸ 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 655128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922740).

655128 is an abundant number, since it is smaller than the sum of its proper divisors (1190352).

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

655128 is a wasteful number, since it uses less digits than its factorization.

655128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 342 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 655128 is about 809.3997776130. The cubic root of 655128 is about 86.8511127673.

The spelling of 655128 in words is "six hundred fifty-five thousand, one hundred twenty-eight".