128889029 has 4 divisors (see below), whose sum is σ = 130165260. Its totient is φ = 127612800.

The previous prime is 128888983. The next prime is 128889049. The reversal of 128889029 is 920988821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55100929 + 73788100 = 7423^2 + 8590^2 .

It is a cyclic number.

It is not a de Polignac number, because 128889029 - 2¹² = 128884933 is a prime.

It is a super-2 number, since 2×128889029² = 33224763593125682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128889049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637964 + ... + 638165.

It is an arithmetic number, because the mean of its divisors is an integer number (32541315).

Almost surely, 2^128889029 is an apocalyptic number.

It is an amenable number.

128889029 is a deficient number, since it is larger than the sum of its proper divisors (1276231).

128889029 is a wasteful number, since it uses less digits than its factorization.

128889029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276230.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 128889029 is about 11352.9304146551. The cubic root of 128889029 is about 505.1325064828.

The spelling of 128889029 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, twenty-nine".