128673535 has 4 divisors (see below), whose sum is σ = 154408248. Its totient is φ = 102938824.

The previous prime is 128673533. The next prime is 128673547. The reversal of 128673535 is 535376821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 535376821 = 7 ⋅76482403.

It is a cyclic number.

It is not a de Polignac number, because 128673535 - 2¹ = 128673533 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128673533) 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, 12867349 + ... + 12867358.

It is an arithmetic number, because the mean of its divisors is an integer number (38602062).

Almost surely, 2^128673535 is an apocalyptic number.

128673535 is a deficient number, since it is larger than the sum of its proper divisors (25734713).

128673535 is an equidigital number, since it uses as much as digits as its factorization.

128673535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25734712.

The product of its digits is 151200, while the sum is 40.

The square root of 128673535 is about 11343.4357669976. The cubic root of 128673535 is about 504.8508333085.

The spelling of 128673535 in words is "one hundred twenty-eight million, six hundred seventy-three thousand, five hundred thirty-five".