18080878 has 4 divisors (see below), whose sum is σ = 27121320. Its totient is φ = 9040438.

The previous prime is 18080869. The next prime is 18080899. The reversal of 18080878 is 87808081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87808081 = 313 ⋅280537.

It is a self number, because there is not a number n which added to its sum of digits gives 18080878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4520218 + ... + 4520221.

It is an arithmetic number, because the mean of its divisors is an integer number (6780330).

Almost surely, 2^18080878 is an apocalyptic number.

18080878 is a deficient number, since it is larger than the sum of its proper divisors (9040442).

18080878 is an equidigital number, since it uses as much as digits as its factorization.

18080878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9040441.

The product of its (nonzero) digits is 28672, while the sum is 40.

The square root of 18080878 is about 4252.1615679558. The cubic root of 18080878 is about 262.4660721079.

The spelling of 18080878 in words is "eighteen million, eighty thousand, eight hundred seventy-eight".