128439528 has 32 divisors (see below), whose sum is σ = 366970560. Its totient is φ = 36696960.

The previous prime is 128439527. The next prime is 128439569. The reversal of 128439528 is 825934821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 128439528.

It is not an unprimeable number, because it can be changed into a prime (128439527) 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, 382093 + ... + 382428.

It is an arithmetic number, because the mean of its divisors is an integer number (11467830).

Almost surely, 2^128439528 is an apocalyptic number.

It is an amenable number.

128439528 is an abundant number, since it is smaller than the sum of its proper divisors (238531032).

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

128439528 is a wasteful number, since it uses less digits than its factorization.

128439528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764537 (or 764533 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 128439528 is about 11333.1164292969. The cubic root of 128439528 is about 504.5446053095.

The spelling of 128439528 in words is "one hundred twenty-eight million, four hundred thirty-nine thousand, five hundred twenty-eight".