128557828 has 24 divisors (see below), whose sum is σ = 257608512. Its totient is φ = 54990624.

The previous prime is 128557817. The next prime is 128557829. The reversal of 128557828 is 828755821.

It is not an unprimeable number, because it can be changed into a prime (128557829) 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, 11475 + ... + 19717.

It is an arithmetic number, because the mean of its divisors is an integer number (10733688).

Almost surely, 2^128557828 is an apocalyptic number.

It is an amenable number.

128557828 is an abundant number, since it is smaller than the sum of its proper divisors (129050684).

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

128557828 is a wasteful number, since it uses less digits than its factorization.

128557828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8811 (or 8809 counting only the distinct ones).

The product of its digits is 358400, while the sum is 46.

The square root of 128557828 is about 11338.3344455877. The cubic root of 128557828 is about 504.6994623900.

It can be divided in two parts, 1285578 and 28, that added together give a triangular number (1285606 = T₁₆₀₃).

The spelling of 128557828 in words is "one hundred twenty-eight million, five hundred fifty-seven thousand, eight hundred twenty-eight".