128525805 has 32 divisors (see below), whose sum is σ = 229461120. Its totient is φ = 68256000.

The previous prime is 128525791. The next prime is 128525807. The reversal of 128525805 is 508525821.

128525805 is a `hidden beast` number, since 1 + 28 + 52 + 580 + 5 = 666.

It is not a de Polignac number, because 128525805 - 2⁵ = 128525773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128525805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128525807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31989 + ... + 35781.

It is an arithmetic number, because the mean of its divisors is an integer number (7170660).

Almost surely, 2^128525805 is an apocalyptic number.

128525805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128525805 is a deficient number, since it is larger than the sum of its proper divisors (100935315).

128525805 is a wasteful number, since it uses less digits than its factorization.

128525805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058 (or 4052 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 128525805 is about 11336.9222013737. The cubic root of 128525805 is about 504.6575530193.

The spelling of 128525805 in words is "one hundred twenty-eight million, five hundred twenty-five thousand, eight hundred five".