86128578 has 12 divisors (see below), whose sum is σ = 186611958. Its totient is φ = 28709520.

The previous prime is 86128573. The next prime is 86128589. The reversal of 86128578 is 87582168.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 22496049 = 7977^2 + 4743^2 .

It is not an unprimeable number, because it can be changed into a prime (86128573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2392443 + ... + 2392478.

Almost surely, 2^86128578 is an apocalyptic number.

86128578 is an abundant number, since it is smaller than the sum of its proper divisors (100483380).

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

86128578 is a wasteful number, since it uses less digits than its factorization.

86128578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784929 (or 4784926 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 86128578 is about 9280.5483674188. The cubic root of 86128578 is about 441.6203649733.

The spelling of 86128578 in words is "eighty-six million, one hundred twenty-eight thousand, five hundred seventy-eight".