128765061 has 12 divisors (see below), whose sum is σ = 186454060. Its totient is φ = 85631040.

The previous prime is 128765059. The next prime is 128765093. The reversal of 128765061 is 160567821.

It can be written as a sum of positive squares in 2 ways, for example, as 98128836 + 30636225 = 9906^2 + 5535^2 .

It is not a de Polignac number, because 128765061 - 2¹ = 128765059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128765011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13810 + ... + 21171.

Almost surely, 2^128765061 is an apocalyptic number.

It is an amenable number.

128765061 is a deficient number, since it is larger than the sum of its proper divisors (57688999).

128765061 is a wasteful number, since it uses less digits than its factorization.

128765061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35396 (or 35393 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 128765061 is about 11347.4693654577. The cubic root of 128765061 is about 504.9705057440.

The spelling of 128765061 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, sixty-one".