128000881 has 16 divisors (see below), whose sum is σ = 133645824. Its totient is φ = 122517504.

The previous prime is 128000861. The next prime is 128000897. The reversal of 128000881 is 188000821.

It is a cyclic number.

It is not a de Polignac number, because 128000881 - 2⁵ = 128000849 is a prime.

It is a super-2 number, since 2×128000881² = 32768451073552322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128000861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 663121 + ... + 663313.

It is an arithmetic number, because the mean of its divisors is an integer number (8352864).

Almost surely, 2^128000881 is an apocalyptic number.

It is an amenable number.

128000881 is a deficient number, since it is larger than the sum of its proper divisors (5644943).

128000881 is a wasteful number, since it uses less digits than its factorization.

128000881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 128000881 is about 11313.7474339849. The cubic root of 128000881 is about 503.9695761953.

It can be divided in two parts, 128000 and 881, that added together give a square (128881 = 359²).

The spelling of 128000881 in words is "one hundred twenty-eight million, eight hundred eighty-one", and thus it is an aban number.