128888949 has 8 divisors (see below), whose sum is σ = 196402240. Its totient is φ = 73650816.

The previous prime is 128888923. The next prime is 128888971. The reversal of 128888949 is 949888821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128888949 - 2⁸ = 128888693 is a prime.

It is a super-2 number, since 2×128888949² = 33224722348649202, 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 (128883949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3068764 + ... + 3068805.

It is an arithmetic number, because the mean of its divisors is an integer number (24550280).

Almost surely, 2^128888949 is an apocalyptic number.

It is an amenable number.

128888949 is a deficient number, since it is larger than the sum of its proper divisors (67513291).

128888949 is an equidigital number, since it uses as much as digits as its factorization.

128888949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6137579.

The product of its digits is 2654208, while the sum is 57.

The square root of 128888949 is about 11352.9268913351. The cubic root of 128888949 is about 505.1324019727.

The spelling of 128888949 in words is "one hundred twenty-eight million, eight hundred eighty-eight thousand, nine hundred forty-nine".