128539028 has 12 divisors (see below), whose sum is σ = 236782560. Its totient is φ = 60886872.

The previous prime is 128539027. The next prime is 128539063. The reversal of 128539028 is 820935821.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 128538982 and 128539000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128539027) 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, 845576 + ... + 845727.

It is an arithmetic number, because the mean of its divisors is an integer number (19731880).

Almost surely, 2^128539028 is an apocalyptic number.

It is an amenable number.

128539028 is a deficient number, since it is larger than the sum of its proper divisors (108243532).

128539028 is a wasteful number, since it uses less digits than its factorization.

128539028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691326 (or 1691324 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 128539028 is about 11337.5053693482. The cubic root of 128539028 is about 504.6748591625.

The spelling of 128539028 in words is "one hundred twenty-eight million, five hundred thirty-nine thousand, twenty-eight".