128793561 has 32 divisors (see below), whose sum is σ = 192073728. Its totient is φ = 76230720.

The previous prime is 128793527. The next prime is 128793607. The reversal of 128793561 is 165397821.

It is not a de Polignac number, because 128793561 - 2¹⁰ = 128792537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128793521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370990 + ... + 371336.

It is an arithmetic number, because the mean of its divisors is an integer number (6002304).

Almost surely, 2^128793561 is an apocalyptic number.

It is an amenable number.

128793561 is a deficient number, since it is larger than the sum of its proper divisors (63280167).

128793561 is a wasteful number, since it uses less digits than its factorization.

128793561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701.

The product of its digits is 90720, while the sum is 42.

The square root of 128793561 is about 11348.7250825809. The cubic root of 128793561 is about 505.0077585973.

The spelling of 128793561 in words is "one hundred twenty-eight million, seven hundred ninety-three thousand, five hundred sixty-one".