18700880 has 80 divisors (see below), whose sum is σ = 48211200. Its totient is φ = 6689280.

The previous prime is 18700861. The next prime is 18700889. The reversal of 18700880 is 8800781.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700889) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 69386 + ... + 69654.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^18700880 is an apocalyptic number.

18700880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18700880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24105600).

18700880 is an abundant number, since it is smaller than the sum of its proper divisors (29510320).

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

18700880 is a wasteful number, since it uses less digits than its factorization.

18700880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 18700880 is about 4324.4514102947. The cubic root of 18700880 is about 265.4324492432.

Subtracting from 18700880 its reverse (8800781), we obtain a palindrome (9900099).

The spelling of 18700880 in words is "eighteen million, seven hundred thousand, eight hundred eighty".