128387428 has 24 divisors (see below), whose sum is σ = 242359488. Its totient is φ = 59158176.

The previous prime is 128387419. The next prime is 128387431. The reversal of 128387428 is 824783821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36975 + ... + 40297.

It is an arithmetic number, because the mean of its divisors is an integer number (10098312).

Almost surely, 2^128387428 is an apocalyptic number.

It is an amenable number.

128387428 is a deficient number, since it is larger than the sum of its proper divisors (113972060).

128387428 is a wasteful number, since it uses less digits than its factorization.

128387428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083 (or 4081 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The square root of 128387428 is about 11330.8176227490. The cubic root of 128387428 is about 504.4763752004.

The spelling of 128387428 in words is "one hundred twenty-eight million, three hundred eighty-seven thousand, four hundred twenty-eight".