128449988 has 24 divisors (see below), whose sum is σ = 235517184. Its totient is φ = 61221600.

The previous prime is 128449973. The next prime is 128449991. The reversal of 128449988 is 889944821.

It is a happy number.

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, 578 + ... + 16038.

It is an arithmetic number, because the mean of its divisors is an integer number (9813216).

Almost surely, 2^128449988 is an apocalyptic number.

It is an amenable number.

128449988 is a deficient number, since it is larger than the sum of its proper divisors (107067196).

128449988 is a wasteful number, since it uses less digits than its factorization.

128449988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15563 (or 15561 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 53.

The square root of 128449988 is about 11333.5778993220. The cubic root of 128449988 is about 504.5583014912.

The spelling of 128449988 in words is "one hundred twenty-eight million, four hundred forty-nine thousand, nine hundred eighty-eight".