128695806 has 12 divisors (see below), whose sum is σ = 278840952. Its totient is φ = 42898596.

The previous prime is 128695769. The next prime is 128695837. The reversal of 128695806 is 608596821.

128695806 is a `hidden beast` number, since 1 + 2 + 8 + 69 + 580 + 6 = 666.

It is a super-2 number, since 2×128695806² = 33125220963979272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3574866 + ... + 3574901.

It is an arithmetic number, because the mean of its divisors is an integer number (23236746).

Almost surely, 2^128695806 is an apocalyptic number.

128695806 is an abundant number, since it is smaller than the sum of its proper divisors (150145146).

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

128695806 is a wasteful number, since it uses less digits than its factorization.

128695806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7149775 (or 7149772 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 128695806 is about 11344.4173935906. The cubic root of 128695806 is about 504.8799583970.

The spelling of 128695806 in words is "one hundred twenty-eight million, six hundred ninety-five thousand, eight hundred six".