128187928 has 32 divisors (see below), whose sum is σ = 265536000. Its totient is φ = 57526560.

The previous prime is 128187923. The next prime is 128187949. The reversal of 128187928 is 829781821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128187923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2268 + ... + 16171.

It is an arithmetic number, because the mean of its divisors is an integer number (8298000).

Almost surely, 2^128187928 is an apocalyptic number.

It is an amenable number.

128187928 is an abundant number, since it is smaller than the sum of its proper divisors (137348072).

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

128187928 is a wasteful number, since it uses less digits than its factorization.

128187928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18535 (or 18531 counting only the distinct ones).

The product of its digits is 129024, while the sum is 46.

The square root of 128187928 is about 11322.0107754762. The cubic root of 128187928 is about 504.2149393966.

The spelling of 128187928 in words is "one hundred twenty-eight million, one hundred eighty-seven thousand, nine hundred twenty-eight".