86784820173 has 20 divisors (see below), whose sum is σ = 135278112288. Its totient is φ = 55341043560.

The previous prime is 86784820153. The next prime is 86784820201. The reversal of 86784820173 is 37102848768.

It is a happy number.

86784820173 is a `hidden beast` number, since 86 + 78 + 482 + 0 + 17 + 3 = 666.

It is not a de Polignac number, because 86784820173 - 2⁸ = 86784819917 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86784820153) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23289823 + ... + 23293548.

Almost surely, 2^86784820173 is an apocalyptic number.

It is an amenable number.

86784820173 is a deficient number, since it is larger than the sum of its proper divisors (48493292115).

86784820173 is a wasteful number, since it uses less digits than its factorization.

86784820173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46583406 (or 46583397 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 86784820173 in words is "eighty-six billion, seven hundred eighty-four million, eight hundred twenty thousand, one hundred seventy-three".