128552809 has 16 divisors (see below), whose sum is σ = 160680960. Its totient is φ = 99916560.

The previous prime is 128552797. The next prime is 128552821. The reversal of 128552809 is 908255821.

It is an interprime number because it is at equal distance from previous prime (128552797) and next prime (128552821).

It is a cyclic number.

It is not a de Polignac number, because 128552809 - 2¹¹ = 128550761 is a prime.

It is a super-3 number, since 3×128552809³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (128552509) 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, 31902 + ... + 35704.

It is an arithmetic number, because the mean of its divisors is an integer number (10042560).

Almost surely, 2^128552809 is an apocalyptic number.

It is an amenable number.

128552809 is a deficient number, since it is larger than the sum of its proper divisors (32128151).

128552809 is a wasteful number, since it uses less digits than its factorization.

128552809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 128552809 is about 11338.1131146236. The cubic root of 128552809 is about 504.6928943482.

The spelling of 128552809 in words is "one hundred twenty-eight million, five hundred fifty-two thousand, eight hundred nine".