128768535 has 80 divisors (see below), whose sum is σ = 269096256. Its totient is φ = 57687552.

The previous prime is 128768527. The next prime is 128768537. The reversal of 128768535 is 535867821.

It is not a de Polignac number, because 128768535 - 2³ = 128768527 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128768537) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 149827 + ... + 150683.

Almost surely, 2^128768535 is an apocalyptic number.

128768535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128768535 is an abundant number, since it is smaller than the sum of its proper divisors (140327721).

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

128768535 is an equidigital number, since it uses as much as digits as its factorization.

128768535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 925 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 128768535 is about 11347.6224382026. The cubic root of 128768535 is about 504.9750469649.

The spelling of 128768535 in words is "one hundred twenty-eight million, seven hundred sixty-eight thousand, five hundred thirty-five".