18688680 has 48 divisors (see below), whose sum is σ = 60739380. Its totient is φ = 4983552.

The previous prime is 18688667. The next prime is 18688711. The reversal of 18688680 is 8688681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18507204 + 181476 = 4302^2 + 426^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25597 + ... + 26316.

Almost surely, 2^18688680 is an apocalyptic number.

18688680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18688680 is an abundant number, since it is smaller than the sum of its proper divisors (42050700).

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

18688680 is a wasteful number, since it uses less digits than its factorization.

18688680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51930 (or 51923 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 18688680 is about 4323.0405966172. The cubic root of 18688680 is about 265.3747161253.

Subtracting from 18688680 its reverse (8688681), we obtain a palindrome (9999999).

It can be divided in two parts, 186886 and 80, that added together give a triangular number (186966 = T₆₁₁).

The spelling of 18688680 in words is "eighteen million, six hundred eighty-eight thousand, six hundred eighty".