128883861 has 12 divisors (see below), whose sum is σ = 186266080. Its totient is φ = 85876200.

The previous prime is 128883841. The next prime is 128883871. The reversal of 128883861 is 168388821.

It is not a de Polignac number, because 128883861 - 2⁵ = 128883829 is a prime.

It is a super-2 number, since 2×128883861² = 33222099252534642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128883841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25386 + ... + 30036.

Almost surely, 2^128883861 is an apocalyptic number.

It is an amenable number.

128883861 is a deficient number, since it is larger than the sum of its proper divisors (57382219).

128883861 is a wasteful number, since it uses less digits than its factorization.

128883861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7736 (or 7733 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 128883861 is about 11352.7028059401. The cubic root of 128883861 is about 505.1257550427.

The spelling of 128883861 in words is "one hundred twenty-eight million, eight hundred eighty-three thousand, eight hundred sixty-one".