18116780 has 24 divisors (see below), whose sum is σ = 41504400. Its totient is φ = 6587840.

The previous prime is 18116767. The next prime is 18116789. The reversal of 18116780 is 8761181.

It is not an unprimeable number, because it can be changed into a prime (18116789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40955 + ... + 41394.

It is an arithmetic number, because the mean of its divisors is an integer number (1729350).

Almost surely, 2^18116780 is an apocalyptic number.

18116780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18116780 is an abundant number, since it is smaller than the sum of its proper divisors (23387620).

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

18116780 is a wasteful number, since it uses less digits than its factorization.

18116780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82369 (or 82367 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 18116780 is about 4256.3810919606. The cubic root of 18116780 is about 262.6396777421.

It can be divided in two parts, 181 and 16780, that added together give a palindrome (16961).

The spelling of 18116780 in words is "eighteen million, one hundred sixteen thousand, seven hundred eighty".