128989035 has 96 divisors (see below), whose sum is σ = 266872320. Its totient is φ = 56415744.

The previous prime is 128989031. The next prime is 128989039. The reversal of 128989035 is 530989821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128989031) and next prime (128989039).

It is not a de Polignac number, because 128989035 - 2² = 128989031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (128989031) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1205452 + ... + 1205558.

It is an arithmetic number, because the mean of its divisors is an integer number (2779920).

Almost surely, 2^128989035 is an apocalyptic number.

128989035 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128989035 is an abundant number, since it is smaller than the sum of its proper divisors (137883285).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128989035 is a wasteful number, since it uses less digits than its factorization.

128989035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 128989035 is about 11357.3339741332. Note that the first 3 decimals coincide. The cubic root of 128989035 is about 505.2631181212.

The spelling of 128989035 in words is "one hundred twenty-eight million, nine hundred eighty-nine thousand, thirty-five".