128845557 has 12 divisors (see below), whose sum is σ = 189265440. Its totient is φ = 84440808.

The previous prime is 128845553. The next prime is 128845559. The reversal of 128845557 is 755548821.

128845557 is a `hidden beast` number, since 12 + 8 + 84 + 5 + 557 = 666.

It is not a de Polignac number, because 128845557 - 2² = 128845553 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128845553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120793 + ... + 121854.

It is an arithmetic number, because the mean of its divisors is an integer number (15772120).

Almost surely, 2^128845557 is an apocalyptic number.

It is an amenable number.

128845557 is a deficient number, since it is larger than the sum of its proper divisors (60419883).

128845557 is a wasteful number, since it uses less digits than its factorization.

128845557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242712 (or 242709 counting only the distinct ones).

The product of its digits is 448000, while the sum is 45.

The square root of 128845557 is about 11351.0156814269. The cubic root of 128845557 is about 505.0757093301.

The spelling of 128845557 in words is "one hundred twenty-eight million, eight hundred forty-five thousand, five hundred fifty-seven".