86578840405 has 16 divisors (see below), whose sum is σ = 111140149680. Its totient is φ = 64516718592.

The previous prime is 86578840399. The next prime is 86578840417. The reversal of 86578840405 is 50404887568.

It can be written as a sum of positive squares in 8 ways, for example, as 2266426449 + 84312413956 = 47607^2 + 290366^2 .

It is a cyclic number.

It is not a de Polignac number, because 86578840405 - 2¹³ = 86578832213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5242140 + ... + 5258629.

It is an arithmetic number, because the mean of its divisors is an integer number (6946259355).

Almost surely, 2^86578840405 is an apocalyptic number.

86578840405 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

86578840405 is a deficient number, since it is larger than the sum of its proper divisors (24561309275).

86578840405 is a wasteful number, since it uses less digits than its factorization.

86578840405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500888.

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 86578840405 in words is "eighty-six billion, five hundred seventy-eight million, eight hundred forty thousand, four hundred five".