189128656 has 20 divisors (see below), whose sum is σ = 366655972. Its totient is φ = 94507776.

The previous prime is 189128651. The next prime is 189128657. The reversal of 189128656 is 656821981.

It can be written as a sum of positive squares in 2 ways, for example, as 188128656 + 1000000 = 13716^2 + 1000^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189128651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41230 + ... + 45586.

Almost surely, 2^189128656 is an apocalyptic number.

189128656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

189128656 is a deficient number, since it is larger than the sum of its proper divisors (177527316).

189128656 is a wasteful number, since it uses less digits than its factorization.

189128656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7078 (or 7072 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 189128656 is about 13752.4054623182. The cubic root of 189128656 is about 574.0095422663.

The spelling of 189128656 in words is "one hundred eighty-nine million, one hundred twenty-eight thousand, six hundred fifty-six".