128856890 has 16 divisors (see below), whose sum is σ = 234112032. Its totient is φ = 51060624.

The previous prime is 128856887. The next prime is 128856929. The reversal of 128856890 is 98658821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59144 + ... + 61283.

It is an arithmetic number, because the mean of its divisors is an integer number (14632002).

Almost surely, 2^128856890 is an apocalyptic number.

128856890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128856890 is a deficient number, since it is larger than the sum of its proper divisors (105255142).

128856890 is a wasteful number, since it uses less digits than its factorization.

128856890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120541.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 128856890 is about 11351.5148768788. The cubic root of 128856890 is about 505.0905173823.

The spelling of 128856890 in words is "one hundred twenty-eight million, eight hundred fifty-six thousand, eight hundred ninety".