128817528 has 64 divisors (see below), whose sum is σ = 368901120. Its totient is φ = 36720000.

The previous prime is 128817527. The next prime is 128817539. The reversal of 128817528 is 825718821.

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 128817528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128817523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125658 + ... + 126678.

It is an arithmetic number, because the mean of its divisors is an integer number (5764080).

Almost surely, 2^128817528 is an apocalyptic number.

It is an amenable number.

128817528 is an abundant number, since it is smaller than the sum of its proper divisors (240083592).

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

128817528 is a wasteful number, since it uses less digits than its factorization.

128817528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 1784 counting only the distinct ones).

The product of its digits is 71680, while the sum is 42.

The square root of 128817528 is about 11349.7809670495. The cubic root of 128817528 is about 505.0390820324.

The spelling of 128817528 in words is "one hundred twenty-eight million, eight hundred seventeen thousand, five hundred twenty-eight".