128856885 has 16 divisors (see below), whose sum is σ = 209666880. Its totient is φ = 67558400.

The previous prime is 128856883. The next prime is 128856887. The reversal of 128856885 is 588658821.

It is an interprime number because it is at equal distance from previous prime (128856883) and next prime (128856887).

It is not a de Polignac number, because 128856885 - 2¹ = 128856883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128856881) 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, 71916 + ... + 73685.

It is an arithmetic number, because the mean of its divisors is an integer number (13104180).

Almost surely, 2^128856885 is an apocalyptic number.

128856885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128856885 is a deficient number, since it is larger than the sum of its proper divisors (80809995).

128856885 is a wasteful number, since it uses less digits than its factorization.

128856885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145668.

The product of its digits is 1228800, while the sum is 51.

The square root of 128856885 is about 11351.5146566438. The cubic root of 128856885 is about 505.0905108493.

The spelling of 128856885 in words is "one hundred twenty-eight million, eight hundred fifty-six thousand, eight hundred eighty-five".