128508388 has 24 divisors (see below), whose sum is σ = 227203200. Its totient is φ = 63597408.

The previous prime is 128508349. The next prime is 128508407. The reversal of 128508388 is 883805821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218631 + ... + 219217.

It is an arithmetic number, because the mean of its divisors is an integer number (9466800).

Almost surely, 2^128508388 is an apocalyptic number.

It is an amenable number.

128508388 is a deficient number, since it is larger than the sum of its proper divisors (98694812).

128508388 is a wasteful number, since it uses less digits than its factorization.

128508388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 128508388 is about 11336.1540215366. The cubic root of 128508388 is about 504.6347559950.

The spelling of 128508388 in words is "one hundred twenty-eight million, five hundred eight thousand, three hundred eighty-eight".