128604561 has 8 divisors (see below), whose sum is σ = 171572064. Its totient is φ = 85686720.

The previous prime is 128604547. The next prime is 128604571. The reversal of 128604561 is 165406821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128604561 - 2¹⁰ = 128603537 is a prime.

It is a super-2 number, since 2×128604561² = 33078266220005442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128604571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5880 + ... + 17081.

It is an arithmetic number, because the mean of its divisors is an integer number (21446508).

Almost surely, 2^128604561 is an apocalyptic number.

It is an amenable number.

128604561 is a deficient number, since it is larger than the sum of its proper divisors (42967503).

128604561 is a wasteful number, since it uses less digits than its factorization.

128604561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24831.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 128604561 is about 11340.3950989372. The cubic root of 128604561 is about 504.7606106502.

The spelling of 128604561 in words is "one hundred twenty-eight million, six hundred four thousand, five hundred sixty-one".