128790861 has 16 divisors (see below), whose sum is σ = 182564928. Its totient is φ = 80480000.

The previous prime is 128790859. The next prime is 128790863. The reversal of 128790861 is 168097821.

It is an interprime number because it is at equal distance from previous prime (128790859) and next prime (128790863).

It is a cyclic number.

It is not a de Polignac number, because 128790861 - 2¹ = 128790859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128790863) 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, 7771 + ... + 17831.

It is an arithmetic number, because the mean of its divisors is an integer number (11410308).

Almost surely, 2^128790861 is an apocalyptic number.

It is an amenable number.

128790861 is a deficient number, since it is larger than the sum of its proper divisors (53774067).

128790861 is a wasteful number, since it uses less digits than its factorization.

128790861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10332.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 128790861 is about 11348.6061258641. The cubic root of 128790861 is about 505.0042296153.

The spelling of 128790861 in words is "one hundred twenty-eight million, seven hundred ninety thousand, eight hundred sixty-one".