128938520 has 16 divisors (see below), whose sum is σ = 290111760. Its totient is φ = 51575392.

The previous prime is 128938501. The next prime is 128938543. The reversal of 128938520 is 25839821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611692 + ... + 1611771.

It is an arithmetic number, because the mean of its divisors is an integer number (18131985).

Almost surely, 2^128938520 is an apocalyptic number.

128938520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128938520 is an abundant number, since it is smaller than the sum of its proper divisors (161173240).

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

128938520 is a wasteful number, since it uses less digits than its factorization.

128938520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223474 (or 3223470 counting only the distinct ones).

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

The square root of 128938520 is about 11355.1098629648. The cubic root of 128938520 is about 505.1971520516.

The spelling of 128938520 in words is "one hundred twenty-eight million, nine hundred thirty-eight thousand, five hundred twenty".